diff --git a/.gitignore b/.gitignore
index 987fee2..fa252ac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 Thumbs.db
 *.blend1
-.c9settings.xml
\ No newline at end of file
+.c9settings.xml
+.idea
+Webgl-lessons.iml
diff --git a/example02/index.html b/example02/index.html
index 8dc0032..5f7b940 100644
--- a/example02/index.html
+++ b/example02/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; Mandelbrot shader on a spinning cube</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 
 <script id="color-shader-fs" type="x-shader/x-fragment">
diff --git a/example02/glMatrix-0.9.5.min.js b/glMatrix-0.9.5.min.js
similarity index 100%
rename from example02/glMatrix-0.9.5.min.js
rename to glMatrix-0.9.5.min.js
diff --git a/lesson01/glMatrix-0.9.5.min.js b/lesson01/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson01/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson01/index.html b/lesson01/index.html
index 36f5560..8ef38b8 100644
--- a/lesson01/index.html
+++ b/lesson01/index.html
@@ -4,7 +4,7 @@
 <title>Learning WebGL &mdash; lesson 1</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
 
 <script id="shader-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson02/glMatrix-0.9.5.min.js b/lesson02/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson02/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson02/index.html b/lesson02/index.html
index ff10ed7..3778c0e 100644
--- a/lesson02/index.html
+++ b/lesson02/index.html
@@ -4,7 +4,7 @@
 <title>Learning WebGL &mdash; lesson 2</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
 
 <script id="shader-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson03/glMatrix-0.9.5.min.js b/lesson03/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson03/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson03/index.html b/lesson03/index.html
index ee8dd63..293430b 100644
--- a/lesson03/index.html
+++ b/lesson03/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 3</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="shader-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson03/webgl-utils.js b/lesson03/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson03/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson04/glMatrix-0.9.5.min.js b/lesson04/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson04/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson04/index.html b/lesson04/index.html
index fb59f98..45498b8 100644
--- a/lesson04/index.html
+++ b/lesson04/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 4</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="shader-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson04/webgl-utils.js b/lesson04/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson04/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson05/glMatrix-0.9.5.min.js b/lesson05/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson05/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson05/index.html b/lesson05/index.html
index 165e1f2..08d77c7 100644
--- a/lesson05/index.html
+++ b/lesson05/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 5</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="shader-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson05/webgl-utils.js b/lesson05/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson05/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson06/glMatrix-0.9.5.min.js b/lesson06/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson06/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson06/index.html b/lesson06/index.html
index b6a2b28..43c46d3 100644
--- a/lesson06/index.html
+++ b/lesson06/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 6</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="shader-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson06/webgl-utils.js b/lesson06/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson06/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson07/glMatrix-0.9.5.min.js b/lesson07/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson07/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson07/index.html b/lesson07/index.html
index c842528..1acbaea 100644
--- a/lesson07/index.html
+++ b/lesson07/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 7</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="shader-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson07/webgl-utils.js b/lesson07/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson07/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson08/glMatrix-0.9.5.min.js b/lesson08/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson08/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson08/index.html b/lesson08/index.html
index b78135e..e0c8838 100644
--- a/lesson08/index.html
+++ b/lesson08/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 8</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="shader-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson08/webgl-utils.js b/lesson08/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson08/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson09/glMatrix-0.9.5.min.js b/lesson09/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson09/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson09/index.html b/lesson09/index.html
index 99f568a..b417878 100644
--- a/lesson09/index.html
+++ b/lesson09/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 9</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="shader-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson09/webgl-utils.js b/lesson09/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson09/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson10/glMatrix-0.9.5.min.js b/lesson10/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson10/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson10/index.html b/lesson10/index.html
index a189fcc..806a436 100644
--- a/lesson10/index.html
+++ b/lesson10/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 10</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="shader-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson10/webgl-utils.js b/lesson10/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson10/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson11/glMatrix-0.9.5.min.js b/lesson11/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson11/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson11/index.html b/lesson11/index.html
index f3fa74a..8f4faff 100644
--- a/lesson11/index.html
+++ b/lesson11/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 11</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="shader-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson11/webgl-utils.js b/lesson11/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson11/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson12/glMatrix-0.9.5.min.js b/lesson12/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson12/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson12/index.html b/lesson12/index.html
index ff1709b..2649b60 100644
--- a/lesson12/index.html
+++ b/lesson12/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 12</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="shader-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson12/webgl-utils.js b/lesson12/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson12/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson13/glMatrix-0.9.5.min.js b/lesson13/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson13/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson13/index.html b/lesson13/index.html
index e961261..700e3fd 100644
--- a/lesson13/index.html
+++ b/lesson13/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 13</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="per-vertex-lighting-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson13/webgl-utils.js b/lesson13/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson13/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson14/glMatrix-0.9.5.min.js b/lesson14/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson14/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson14/index.html b/lesson14/index.html
index 0c07947..09604e1 100644
--- a/lesson14/index.html
+++ b/lesson14/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 14</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="per-fragment-lighting-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson14/webgl-utils.js b/lesson14/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson14/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson15/glMatrix-0.9.5.min.js b/lesson15/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson15/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson15/index.html b/lesson15/index.html
index d53d0b4..7df5782 100644
--- a/lesson15/index.html
+++ b/lesson15/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 15</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="per-fragment-lighting-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson15/webgl-utils.js b/lesson15/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson15/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/lesson16/glMatrix-0.9.5.min.js b/lesson16/glMatrix-0.9.5.min.js
deleted file mode 100644
index 4e4a830..0000000
--- a/lesson16/glMatrix-0.9.5.min.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// glMatrix v0.9.5
-glMatrixArrayType=typeof Float32Array!="undefined"?Float32Array:typeof WebGLFloatArray!="undefined"?WebGLFloatArray:Array;var vec3={};vec3.create=function(a){var b=new glMatrixArrayType(3);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2]}return b};vec3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];return b};vec3.add=function(a,b,c){if(!c||a==c){a[0]+=b[0];a[1]+=b[1];a[2]+=b[2];return a}c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];return c};
-vec3.subtract=function(a,b,c){if(!c||a==c){a[0]-=b[0];a[1]-=b[1];a[2]-=b[2];return a}c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];return c};vec3.negate=function(a,b){b||(b=a);b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];return b};vec3.scale=function(a,b,c){if(!c||a==c){a[0]*=b;a[1]*=b;a[2]*=b;return a}c[0]=a[0]*b;c[1]=a[1]*b;c[2]=a[2]*b;return c};
-vec3.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=Math.sqrt(c*c+d*d+e*e);if(g){if(g==1){b[0]=c;b[1]=d;b[2]=e;return b}}else{b[0]=0;b[1]=0;b[2]=0;return b}g=1/g;b[0]=c*g;b[1]=d*g;b[2]=e*g;return b};vec3.cross=function(a,b,c){c||(c=a);var d=a[0],e=a[1];a=a[2];var g=b[0],f=b[1];b=b[2];c[0]=e*b-a*f;c[1]=a*g-d*b;c[2]=d*f-e*g;return c};vec3.length=function(a){var b=a[0],c=a[1];a=a[2];return Math.sqrt(b*b+c*c+a*a)};vec3.dot=function(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]};
-vec3.direction=function(a,b,c){c||(c=a);var d=a[0]-b[0],e=a[1]-b[1];a=a[2]-b[2];b=Math.sqrt(d*d+e*e+a*a);if(!b){c[0]=0;c[1]=0;c[2]=0;return c}b=1/b;c[0]=d*b;c[1]=e*b;c[2]=a*b;return c};vec3.lerp=function(a,b,c,d){d||(d=a);d[0]=a[0]+c*(b[0]-a[0]);d[1]=a[1]+c*(b[1]-a[1]);d[2]=a[2]+c*(b[2]-a[2]);return d};vec3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+"]"};var mat3={};
-mat3.create=function(a){var b=new glMatrixArrayType(9);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9]}return b};mat3.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];return b};mat3.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=1;a[5]=0;a[6]=0;a[7]=0;a[8]=1;return a};
-mat3.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[5];a[1]=a[3];a[2]=a[6];a[3]=c;a[5]=a[7];a[6]=d;a[7]=e;return a}b[0]=a[0];b[1]=a[3];b[2]=a[6];b[3]=a[1];b[4]=a[4];b[5]=a[7];b[6]=a[2];b[7]=a[5];b[8]=a[8];return b};mat3.toMat4=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=0;b[4]=a[3];b[5]=a[4];b[6]=a[5];b[7]=0;b[8]=a[6];b[9]=a[7];b[10]=a[8];b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat3.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+"]"};var mat4={};mat4.create=function(a){var b=new glMatrixArrayType(16);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15]}return b};
-mat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=a[12];b[13]=a[13];b[14]=a[14];b[15]=a[15];return b};mat4.identity=function(a){a[0]=1;a[1]=0;a[2]=0;a[3]=0;a[4]=0;a[5]=1;a[6]=0;a[7]=0;a[8]=0;a[9]=0;a[10]=1;a[11]=0;a[12]=0;a[13]=0;a[14]=0;a[15]=1;return a};
-mat4.transpose=function(a,b){if(!b||a==b){var c=a[1],d=a[2],e=a[3],g=a[6],f=a[7],h=a[11];a[1]=a[4];a[2]=a[8];a[3]=a[12];a[4]=c;a[6]=a[9];a[7]=a[13];a[8]=d;a[9]=g;a[11]=a[14];a[12]=e;a[13]=f;a[14]=h;return a}b[0]=a[0];b[1]=a[4];b[2]=a[8];b[3]=a[12];b[4]=a[1];b[5]=a[5];b[6]=a[9];b[7]=a[13];b[8]=a[2];b[9]=a[6];b[10]=a[10];b[11]=a[14];b[12]=a[3];b[13]=a[7];b[14]=a[11];b[15]=a[15];return b};
-mat4.determinant=function(a){var b=a[0],c=a[1],d=a[2],e=a[3],g=a[4],f=a[5],h=a[6],i=a[7],j=a[8],k=a[9],l=a[10],o=a[11],m=a[12],n=a[13],p=a[14];a=a[15];return m*k*h*e-j*n*h*e-m*f*l*e+g*n*l*e+j*f*p*e-g*k*p*e-m*k*d*i+j*n*d*i+m*c*l*i-b*n*l*i-j*c*p*i+b*k*p*i+m*f*d*o-g*n*d*o-m*c*h*o+b*n*h*o+g*c*p*o-b*f*p*o-j*f*d*a+g*k*d*a+j*c*h*a-b*k*h*a-g*c*l*a+b*f*l*a};
-mat4.inverse=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=a[4],h=a[5],i=a[6],j=a[7],k=a[8],l=a[9],o=a[10],m=a[11],n=a[12],p=a[13],r=a[14],s=a[15],A=c*h-d*f,B=c*i-e*f,t=c*j-g*f,u=d*i-e*h,v=d*j-g*h,w=e*j-g*i,x=k*p-l*n,y=k*r-o*n,z=k*s-m*n,C=l*r-o*p,D=l*s-m*p,E=o*s-m*r,q=1/(A*E-B*D+t*C+u*z-v*y+w*x);b[0]=(h*E-i*D+j*C)*q;b[1]=(-d*E+e*D-g*C)*q;b[2]=(p*w-r*v+s*u)*q;b[3]=(-l*w+o*v-m*u)*q;b[4]=(-f*E+i*z-j*y)*q;b[5]=(c*E-e*z+g*y)*q;b[6]=(-n*w+r*t-s*B)*q;b[7]=(k*w-o*t+m*B)*q;b[8]=(f*D-h*z+j*x)*q;
-b[9]=(-c*D+d*z-g*x)*q;b[10]=(n*v-p*t+s*A)*q;b[11]=(-k*v+l*t-m*A)*q;b[12]=(-f*C+h*y-i*x)*q;b[13]=(c*C-d*y+e*x)*q;b[14]=(-n*u+p*B-r*A)*q;b[15]=(k*u-l*B+o*A)*q;return b};mat4.toRotationMat=function(a,b){b||(b=mat4.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];b[4]=a[4];b[5]=a[5];b[6]=a[6];b[7]=a[7];b[8]=a[8];b[9]=a[9];b[10]=a[10];b[11]=a[11];b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};
-mat4.toMat3=function(a,b){b||(b=mat3.create());b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[4];b[4]=a[5];b[5]=a[6];b[6]=a[8];b[7]=a[9];b[8]=a[10];return b};mat4.toInverseMat3=function(a,b){var c=a[0],d=a[1],e=a[2],g=a[4],f=a[5],h=a[6],i=a[8],j=a[9],k=a[10],l=k*f-h*j,o=-k*g+h*i,m=j*g-f*i,n=c*l+d*o+e*m;if(!n)return null;n=1/n;b||(b=mat3.create());b[0]=l*n;b[1]=(-k*d+e*j)*n;b[2]=(h*d-e*f)*n;b[3]=o*n;b[4]=(k*c-e*i)*n;b[5]=(-h*c+e*g)*n;b[6]=m*n;b[7]=(-j*c+d*i)*n;b[8]=(f*c-d*g)*n;return b};
-mat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2],f=a[3],h=a[4],i=a[5],j=a[6],k=a[7],l=a[8],o=a[9],m=a[10],n=a[11],p=a[12],r=a[13],s=a[14];a=a[15];var A=b[0],B=b[1],t=b[2],u=b[3],v=b[4],w=b[5],x=b[6],y=b[7],z=b[8],C=b[9],D=b[10],E=b[11],q=b[12],F=b[13],G=b[14];b=b[15];c[0]=A*d+B*h+t*l+u*p;c[1]=A*e+B*i+t*o+u*r;c[2]=A*g+B*j+t*m+u*s;c[3]=A*f+B*k+t*n+u*a;c[4]=v*d+w*h+x*l+y*p;c[5]=v*e+w*i+x*o+y*r;c[6]=v*g+w*j+x*m+y*s;c[7]=v*f+w*k+x*n+y*a;c[8]=z*d+C*h+D*l+E*p;c[9]=z*e+C*i+D*o+E*r;c[10]=z*
-g+C*j+D*m+E*s;c[11]=z*f+C*k+D*n+E*a;c[12]=q*d+F*h+G*l+b*p;c[13]=q*e+F*i+G*o+b*r;c[14]=q*g+F*j+G*m+b*s;c[15]=q*f+F*k+G*n+b*a;return c};mat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1];b=b[2];c[0]=a[0]*d+a[4]*e+a[8]*b+a[12];c[1]=a[1]*d+a[5]*e+a[9]*b+a[13];c[2]=a[2]*d+a[6]*e+a[10]*b+a[14];return c};
-mat4.multiplyVec4=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=b[3];c[0]=a[0]*d+a[4]*e+a[8]*g+a[12]*b;c[1]=a[1]*d+a[5]*e+a[9]*g+a[13]*b;c[2]=a[2]*d+a[6]*e+a[10]*g+a[14]*b;c[3]=a[3]*d+a[7]*e+a[11]*g+a[15]*b;return c};
-mat4.translate=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[12]=a[0]*d+a[4]*e+a[8]*b+a[12];a[13]=a[1]*d+a[5]*e+a[9]*b+a[13];a[14]=a[2]*d+a[6]*e+a[10]*b+a[14];a[15]=a[3]*d+a[7]*e+a[11]*b+a[15];return a}var g=a[0],f=a[1],h=a[2],i=a[3],j=a[4],k=a[5],l=a[6],o=a[7],m=a[8],n=a[9],p=a[10],r=a[11];c[0]=g;c[1]=f;c[2]=h;c[3]=i;c[4]=j;c[5]=k;c[6]=l;c[7]=o;c[8]=m;c[9]=n;c[10]=p;c[11]=r;c[12]=g*d+j*e+m*b+a[12];c[13]=f*d+k*e+n*b+a[13];c[14]=h*d+l*e+p*b+a[14];c[15]=i*d+o*e+r*b+a[15];return c};
-mat4.scale=function(a,b,c){var d=b[0],e=b[1];b=b[2];if(!c||a==c){a[0]*=d;a[1]*=d;a[2]*=d;a[3]*=d;a[4]*=e;a[5]*=e;a[6]*=e;a[7]*=e;a[8]*=b;a[9]*=b;a[10]*=b;a[11]*=b;return a}c[0]=a[0]*d;c[1]=a[1]*d;c[2]=a[2]*d;c[3]=a[3]*d;c[4]=a[4]*e;c[5]=a[5]*e;c[6]=a[6]*e;c[7]=a[7]*e;c[8]=a[8]*b;c[9]=a[9]*b;c[10]=a[10]*b;c[11]=a[11]*b;c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15];return c};
-mat4.rotate=function(a,b,c,d){var e=c[0],g=c[1];c=c[2];var f=Math.sqrt(e*e+g*g+c*c);if(!f)return null;if(f!=1){f=1/f;e*=f;g*=f;c*=f}var h=Math.sin(b),i=Math.cos(b),j=1-i;b=a[0];f=a[1];var k=a[2],l=a[3],o=a[4],m=a[5],n=a[6],p=a[7],r=a[8],s=a[9],A=a[10],B=a[11],t=e*e*j+i,u=g*e*j+c*h,v=c*e*j-g*h,w=e*g*j-c*h,x=g*g*j+i,y=c*g*j+e*h,z=e*c*j+g*h;e=g*c*j-e*h;g=c*c*j+i;if(d){if(a!=d){d[12]=a[12];d[13]=a[13];d[14]=a[14];d[15]=a[15]}}else d=a;d[0]=b*t+o*u+r*v;d[1]=f*t+m*u+s*v;d[2]=k*t+n*u+A*v;d[3]=l*t+p*u+B*
-v;d[4]=b*w+o*x+r*y;d[5]=f*w+m*x+s*y;d[6]=k*w+n*x+A*y;d[7]=l*w+p*x+B*y;d[8]=b*z+o*e+r*g;d[9]=f*z+m*e+s*g;d[10]=k*z+n*e+A*g;d[11]=l*z+p*e+B*g;return d};mat4.rotateX=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[4],g=a[5],f=a[6],h=a[7],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[0]=a[0];c[1]=a[1];c[2]=a[2];c[3]=a[3];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[4]=e*b+i*d;c[5]=g*b+j*d;c[6]=f*b+k*d;c[7]=h*b+l*d;c[8]=e*-d+i*b;c[9]=g*-d+j*b;c[10]=f*-d+k*b;c[11]=h*-d+l*b;return c};
-mat4.rotateY=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[8],j=a[9],k=a[10],l=a[11];if(c){if(a!=c){c[4]=a[4];c[5]=a[5];c[6]=a[6];c[7]=a[7];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*-d;c[1]=g*b+j*-d;c[2]=f*b+k*-d;c[3]=h*b+l*-d;c[8]=e*d+i*b;c[9]=g*d+j*b;c[10]=f*d+k*b;c[11]=h*d+l*b;return c};
-mat4.rotateZ=function(a,b,c){var d=Math.sin(b);b=Math.cos(b);var e=a[0],g=a[1],f=a[2],h=a[3],i=a[4],j=a[5],k=a[6],l=a[7];if(c){if(a!=c){c[8]=a[8];c[9]=a[9];c[10]=a[10];c[11]=a[11];c[12]=a[12];c[13]=a[13];c[14]=a[14];c[15]=a[15]}}else c=a;c[0]=e*b+i*d;c[1]=g*b+j*d;c[2]=f*b+k*d;c[3]=h*b+l*d;c[4]=e*-d+i*b;c[5]=g*-d+j*b;c[6]=f*-d+k*b;c[7]=h*-d+l*b;return c};
-mat4.frustum=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=e*2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=e*2/i;f[6]=0;f[7]=0;f[8]=(b+a)/h;f[9]=(d+c)/i;f[10]=-(g+e)/j;f[11]=-1;f[12]=0;f[13]=0;f[14]=-(g*e*2)/j;f[15]=0;return f};mat4.perspective=function(a,b,c,d,e){a=c*Math.tan(a*Math.PI/360);b=a*b;return mat4.frustum(-b,b,-a,a,c,d,e)};
-mat4.ortho=function(a,b,c,d,e,g,f){f||(f=mat4.create());var h=b-a,i=d-c,j=g-e;f[0]=2/h;f[1]=0;f[2]=0;f[3]=0;f[4]=0;f[5]=2/i;f[6]=0;f[7]=0;f[8]=0;f[9]=0;f[10]=-2/j;f[11]=0;f[12]=-(a+b)/h;f[13]=-(d+c)/i;f[14]=-(g+e)/j;f[15]=1;return f};
-mat4.lookAt=function(a,b,c,d){d||(d=mat4.create());var e=a[0],g=a[1];a=a[2];var f=c[0],h=c[1],i=c[2];c=b[1];var j=b[2];if(e==b[0]&&g==c&&a==j)return mat4.identity(d);var k,l,o,m;c=e-b[0];j=g-b[1];b=a-b[2];m=1/Math.sqrt(c*c+j*j+b*b);c*=m;j*=m;b*=m;k=h*b-i*j;i=i*c-f*b;f=f*j-h*c;if(m=Math.sqrt(k*k+i*i+f*f)){m=1/m;k*=m;i*=m;f*=m}else f=i=k=0;h=j*f-b*i;l=b*k-c*f;o=c*i-j*k;if(m=Math.sqrt(h*h+l*l+o*o)){m=1/m;h*=m;l*=m;o*=m}else o=l=h=0;d[0]=k;d[1]=h;d[2]=c;d[3]=0;d[4]=i;d[5]=l;d[6]=j;d[7]=0;d[8]=f;d[9]=
-o;d[10]=b;d[11]=0;d[12]=-(k*e+i*g+f*a);d[13]=-(h*e+l*g+o*a);d[14]=-(c*e+j*g+b*a);d[15]=1;return d};mat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+", "+a[4]+", "+a[5]+", "+a[6]+", "+a[7]+", "+a[8]+", "+a[9]+", "+a[10]+", "+a[11]+", "+a[12]+", "+a[13]+", "+a[14]+", "+a[15]+"]"};quat4={};quat4.create=function(a){var b=new glMatrixArrayType(4);if(a){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3]}return b};quat4.set=function(a,b){b[0]=a[0];b[1]=a[1];b[2]=a[2];b[3]=a[3];return b};
-quat4.calculateW=function(a,b){var c=a[0],d=a[1],e=a[2];if(!b||a==b){a[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return a}b[0]=c;b[1]=d;b[2]=e;b[3]=-Math.sqrt(Math.abs(1-c*c-d*d-e*e));return b};quat4.inverse=function(a,b){if(!b||a==b){a[0]*=1;a[1]*=1;a[2]*=1;return a}b[0]=-a[0];b[1]=-a[1];b[2]=-a[2];b[3]=a[3];return b};quat4.length=function(a){var b=a[0],c=a[1],d=a[2];a=a[3];return Math.sqrt(b*b+c*c+d*d+a*a)};
-quat4.normalize=function(a,b){b||(b=a);var c=a[0],d=a[1],e=a[2],g=a[3],f=Math.sqrt(c*c+d*d+e*e+g*g);if(f==0){b[0]=0;b[1]=0;b[2]=0;b[3]=0;return b}f=1/f;b[0]=c*f;b[1]=d*f;b[2]=e*f;b[3]=g*f;return b};quat4.multiply=function(a,b,c){c||(c=a);var d=a[0],e=a[1],g=a[2];a=a[3];var f=b[0],h=b[1],i=b[2];b=b[3];c[0]=d*b+a*f+e*i-g*h;c[1]=e*b+a*h+g*f-d*i;c[2]=g*b+a*i+d*h-e*f;c[3]=a*b-d*f-e*h-g*i;return c};
-quat4.multiplyVec3=function(a,b,c){c||(c=b);var d=b[0],e=b[1],g=b[2];b=a[0];var f=a[1],h=a[2];a=a[3];var i=a*d+f*g-h*e,j=a*e+h*d-b*g,k=a*g+b*e-f*d;d=-b*d-f*e-h*g;c[0]=i*a+d*-b+j*-h-k*-f;c[1]=j*a+d*-f+k*-b-i*-h;c[2]=k*a+d*-h+i*-f-j*-b;return c};quat4.toMat3=function(a,b){b||(b=mat3.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=k+g;b[4]=1-(j+e);b[5]=d-f;b[6]=c-h;b[7]=d+f;b[8]=1-(j+l);return b};
-quat4.toMat4=function(a,b){b||(b=mat4.create());var c=a[0],d=a[1],e=a[2],g=a[3],f=c+c,h=d+d,i=e+e,j=c*f,k=c*h;c=c*i;var l=d*h;d=d*i;e=e*i;f=g*f;h=g*h;g=g*i;b[0]=1-(l+e);b[1]=k-g;b[2]=c+h;b[3]=0;b[4]=k+g;b[5]=1-(j+e);b[6]=d-f;b[7]=0;b[8]=c-h;b[9]=d+f;b[10]=1-(j+l);b[11]=0;b[12]=0;b[13]=0;b[14]=0;b[15]=1;return b};quat4.slerp=function(a,b,c,d){d||(d=a);var e=c;if(a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]<0)e=-1*c;d[0]=1-c*a[0]+e*b[0];d[1]=1-c*a[1]+e*b[1];d[2]=1-c*a[2]+e*b[2];d[3]=1-c*a[3]+e*b[3];return d};
-quat4.str=function(a){return"["+a[0]+", "+a[1]+", "+a[2]+", "+a[3]+"]"};
diff --git a/lesson16/index.html b/lesson16/index.html
index 558a20e..f0a6a85 100644
--- a/lesson16/index.html
+++ b/lesson16/index.html
@@ -4,8 +4,8 @@
 <title>Learning WebGL &mdash; lesson 16</title>
 <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
 
-<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
-<script type="text/javascript" src="webgl-utils.js"></script>
+<script type="text/javascript" src="../glMatrix-0.9.5.min.js"></script>
+<script type="text/javascript" src="../webgl-utils.js"></script>
 
 <script id="per-fragment-lighting-fs" type="x-shader/x-fragment">
     precision mediump float;
diff --git a/lesson16/webgl-utils.js b/lesson16/webgl-utils.js
deleted file mode 100644
index b9da47e..0000000
--- a/lesson16/webgl-utils.js
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * Copyright 2010, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/**
- * @fileoverview This file contains functions every webgl program will need
- * a version of one way or another.
- *
- * Instead of setting up a context manually it is recommended to
- * use. This will check for success or failure. On failure it
- * will attempt to present an approriate message to the user.
- *
- *       gl = WebGLUtils.setupWebGL(canvas);
- *
- * For animated WebGL apps use of setTimeout or setInterval are
- * discouraged. It is recommended you structure your rendering
- * loop like this.
- *
- *       function render() {
- *         window.requestAnimFrame(render, canvas);
- *
- *         // do rendering
- *         ...
- *       }
- *       render();
- *
- * This will call your rendering function up to the refresh rate
- * of your display but will stop rendering if your app is not
- * visible.
- */
-
-WebGLUtils = function() {
-
-/**
- * Creates the HTLM for a failure message
- * @param {string} canvasContainerId id of container of th
- *        canvas.
- * @return {string} The html.
- */
-var makeFailHTML = function(msg) {
-  return '' +
-    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
-    '<td align="center">' +
-    '<div style="display: table-cell; vertical-align: middle;">' +
-    '<div style="">' + msg + '</div>' +
-    '</div>' +
-    '</td></tr></table>';
-};
-
-/**
- * Mesasge for getting a webgl browser
- * @type {string}
- */
-var GET_A_WEBGL_BROWSER = '' +
-  'This page requires a browser that supports WebGL.<br/>' +
-  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
-
-/**
- * Mesasge for need better hardware
- * @type {string}
- */
-var OTHER_PROBLEM = '' +
-  "It doesn't appear your computer can support WebGL.<br/>" +
-  '<a href="http://get.webgl.org/troubleshooting/">Click here for more information.</a>';
-
-/**
- * Creates a webgl context. If creation fails it will
- * change the contents of the container of the <canvas>
- * tag to an error message with the correct links for WebGL.
- * @param {Element} canvas. The canvas element to create a
- *     context from.
- * @param {WebGLContextCreationAttirbutes} opt_attribs Any
- *     creation attributes you want to pass in.
- * @param {function:(msg)} opt_onError An function to call
- *     if there is an error during creation.
- * @return {WebGLRenderingContext} The created context.
- */
-var setupWebGL = function(canvas, opt_attribs, opt_onError) {
-  function handleCreationError(msg) {
-    var container = canvas.parentNode;
-    if (container) {
-      var str = window.WebGLRenderingContext ?
-           OTHER_PROBLEM :
-           GET_A_WEBGL_BROWSER;
-      if (msg) {
-        str += "<br/><br/>Status: " + msg;
-      }
-      container.innerHTML = makeFailHTML(str);
-    }
-  };
-
-  opt_onError = opt_onError || handleCreationError;
-
-  if (canvas.addEventListener) {
-    canvas.addEventListener("webglcontextcreationerror", function(event) {
-          opt_onError(event.statusMessage);
-        }, false);
-  }
-  var context = create3DContext(canvas, opt_attribs);
-  if (!context) {
-    if (!window.WebGLRenderingContext) {
-      opt_onError("");
-    }
-  }
-  return context;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} canvas The canvas tag to get context
- *     from. If one is not passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(canvas, opt_attribs) {
-  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
-  var context = null;
-  for (var ii = 0; ii < names.length; ++ii) {
-    try {
-      context = canvas.getContext(names[ii], opt_attribs);
-    } catch(e) {}
-    if (context) {
-      break;
-    }
-  }
-  return context;
-}
-
-return {
-  create3DContext: create3DContext,
-  setupWebGL: setupWebGL
-};
-}();
-
-/**
- * Provides requestAnimationFrame in a cross browser way.
- */
-window.requestAnimFrame = (function() {
-  return window.requestAnimationFrame ||
-         window.webkitRequestAnimationFrame ||
-         window.mozRequestAnimationFrame ||
-         window.oRequestAnimationFrame ||
-         window.msRequestAnimationFrame ||
-         function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
-           window.setTimeout(callback, 1000/60);
-         };
-})();
-
diff --git a/example02/webgl-utils.js b/webgl-utils.js
similarity index 100%
rename from example02/webgl-utils.js
rename to webgl-utils.js