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lightball01-vertex-shader-discard.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - skipping triangles in glsl</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
html, body {
font-family: Monospace;
background-color: #000;
color: #fff;
margin: 0px;
overflow: hidden;
width: 100%;
height: 100%;
}
canvas {
width: 100%;
height: 100%;
}
#info {
position: absolute;
top: 10px;
width: 100%;
text-align: center;
z-index: 100;
display:block;
}
#info a, .button { color: #f00; font-weight: bold; text-decoration: underline; cursor: pointer }
.num {
color: red;
font-weight: bold;
}
</style>
</head>
<body>
<div id="info">
<div><a href="http://threejs.org" target="_blank">three.js</a> - skipping triangles in glsl - by <a href="http://games.greggman.com" target="_blank">greggman</a></div>
<div>skipping triangle number <span class="num" id="tri-id"></span> of every <span class="num" id="tri-mod"></span> triangles</div>
</div>
<script src="js/three.min.js"></script>
<script src="js/three/js/utils/GeometryUtils.js"></script>
<script src="js/three/js/shaders/CopyShader.js"></script>
<script src="js/three/js/postprocessing/EffectComposer.js"></script>
<script src="js/three/js/postprocessing/MaskPass.js"></script>
<script src="js/three/js/postprocessing/RenderPass.js"></script>
<script src="js/three/js/postprocessing/ShaderPass.js"></script>
<script src="js/three/js/Detector.js"></script>
<script src="js/three/js/libs/stats.min.js"></script>
<script type="not-js" id="vertexshader">
attribute float vertexId;
uniform float triangleMod;
uniform float triangleHideId;
varying vec3 vNormal;
void main() {
vNormal = normal;
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
float triangleId = floor(vertexId / 3.0) + 0.05;
float triId = mod(triangleId, triangleMod);
float diff = abs(triId - triangleHideId);
if ( diff < 0.1 ) {
// put this vertex behind the camera.
// since all 3 of a given triangle will do this
// that will get the triangle clipped.
gl_Position = vec4(0, 0, 2, 1);
}
}
</script>
<script type="not-js" id="fragmentshader">
varying vec3 vNormal;
uniform vec3 color;
void main() {
vec3 light = vec3( 0.5, 0.2, 1.0 );
light = normalize( light );
float dProd = dot( vNormal, light ) * 0.5 + 0.5;
gl_FragColor = vec4( vec3( dProd ) * vec3( color ), 1.0 );
}
</script>
<script>
"use strict";
if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
var container, stats, permalink, hex, color;
var camera, cameraTarget, scene, renderer;
var composer;
var renderTarget;
var group, textMesh1, textMesh2, textGeo, material;
var scenes = {};
var text = "three.js",
height = 20,
size = 70,
hover = 30;
var targetRotation = 0;
var targetRotationOnMouseDown = 0;
var mouseX = 0;
var mouseXOnMouseDown = 0;
var triIdNode = getTextNode("tri-id");
var triModNode = getTextNode("tri-mod");
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
var postprocessing = { enabled : false };
var glow = 0.9;
var globalOptions = {
};
var renderModel;
init();
animate();
function getTextNode( id ) {
var elem = document.getElementById( id );
var node = document.createTextNode( "" );
elem.appendChild( node );
return node;
}
function init() {
container = document.body;
// CAMERA
camera = new THREE.PerspectiveCamera( 30, 1, 1, 1500 );
camera.position.set( 0, 400, 700 );
cameraTarget = new THREE.Vector3( 0, 150, 0 );
globalOptions.scene = "spheres";
scenes.spheres = createSphereScene();
scene = scenes.spheres;
// RENDERER
renderer = new THREE.WebGLRenderer( { antialias: true } );
container.appendChild( renderer.domElement );
renderer.setPixelRatio( 2 );
// STATS
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
//container.appendChild( stats.domElement );
// POSTPROCESSING
renderer.autoClear = false;
renderModel = new THREE.RenderPass( scene, camera );
renderModel.renderToScreen = true;
var parameters = { minFilter: THREE.LinearFilter, magFilter: THREE.LinearFilter, format: THREE.RGBFormat, stencilBuffer: false };
renderTarget = new THREE.WebGLRenderTarget( 1, 1, parameters );
setRenderTargetSize();
composer = new THREE.EffectComposer( renderer, renderTarget );
composer.addPass( renderModel );
//
initGUI();
// EVENTS
renderer.domElement.addEventListener( 'mousedown', onDocumentMouseDown, false );
renderer.domElement.addEventListener( 'touchstart', onDocumentTouchStart, false );
renderer.domElement.addEventListener( 'touchmove', onDocumentTouchMove, false );
window.addEventListener( 'resize', onWindowResize, false );
onWindowResize();
}
function createSphereScene() {
// SCENE
var scene = new THREE.Scene();
scene.fog = new THREE.Fog( 0x0000A0, 250, 1400 );
// LIGHTS
var dirLight = new THREE.DirectionalLight( 0xffffff, 1.725 );
dirLight.position.set( 200, 100, 100 ).normalize();
scene.add( dirLight );
var pointLight = new THREE.PointLight( 0xffffff, 1.5 );
pointLight.position.set( -120, 0, 50 );
scene.add( pointLight );
var group = new THREE.Group();
group.position.y = 120;
var radius = 150;
var geometry = new THREE.IcosahedronGeometry( radius * 0.8, 1 );
var mat1 = new THREE.MeshLambertMaterial( { color: 0x4fff8f, shading: THREE.FlatShading } );
var modelM = new THREE.Mesh( geometry, mat1 );
group.add( modelM );
var attributes = {
vertexId: { type: 'f', value: [] }
};
var uniforms = {
color: { type: "c", value: new THREE.Color( 0xff2200 ) },
triangleMod: { type: "f", value: 10, },
triangleHideId: { type: "f", value: 1, },
};
var shaderMaterial = new THREE.ShaderMaterial( {
uniforms: uniforms,
attributes: attributes,
vertexShader: document.getElementById( 'vertexshader' ).textContent,
fragmentShader: document.getElementById( 'fragmentshader' ).textContent
});
var geometry = new THREE.SphereGeometry( radius, 48, 24 );
var sphere = new THREE.Mesh( geometry, shaderMaterial );
sphere.geometry = new THREE.BufferGeometry().fromGeometry( sphere.geometry );
var numVerts = sphere.geometry.attributes.position.length / 3;
var vertexIds = new Float32Array(numVerts);
for ( var v = 0; v < numVerts; ++v ) {
vertexIds[ v ] = v;
}
var vertexIdAttribute = new THREE.BufferAttribute( vertexIds, 1 );
vertexIdAttribute.needsUpdate = true;
sphere.geometry.addAttribute( "vertexId", vertexIdAttribute );
group.add( sphere );
scene.add( group );
var frameCount = 0;
return {
update: function() {
if (frameCount % (60 * 3) == 0) {
uniforms.triangleMod.value = uniforms.triangleMod.value + 1;
if (uniforms.triangleMod.value > 20) {
uniforms.triangleMod.value = 2;
}
triModNode.nodeValue = uniforms.triangleMod.value;
}
if (frameCount % 30 == 0) {
uniforms.triangleHideId.value = (uniforms.triangleHideId.value + 1) % uniforms.triangleMod.value;
triIdNode.nodeValue = uniforms.triangleHideId.value;
}
++frameCount;
sphere.rotation.z += 0.002;
modelM.rotation.x += 0.003;
group.rotation.y += ( targetRotation - group.rotation.y ) * 0.05;
},
getScene: function() {
return scene;
}
};
}
function isMobile() {
var ua = navigator.userAgent.toLowerCase();
return ua.indexOf( "iphone" ) >= 0 || ua.indexOf( "mobile" ) >= 0;
}
function initGUI() {
}
function setRenderTargetSize() {
// Make it twice as many pixels as there are glyphs
var width = renderer.context.drawingBufferWidth ;
var height = renderer.context.drawingBufferHeight;
if ( renderTarget.width !== width || renderTarget.height !== height ) {
renderTarget.setSize( width, height );
}
}
function onWindowResize() {
windowHalfX = window.innerWidth / 2;
windowHalfY = window.innerHeight / 2;
renderer.setSize( renderer.domElement.clientWidth, renderer.domElement.clientHeight, false );
setRenderTargetSize();
composer.reset();
Object.keys( scenes ).forEach( function( sceneName ) {
var scene = scenes[ sceneName ];
if ( scene.resize ) {
scene.resize();
}
} );
}
//
function onDocumentMouseDown( event ) {
event.preventDefault();
renderer.domElement.addEventListener( 'mousemove', onDocumentMouseMove, false );
renderer.domElement.addEventListener( 'mouseup', onDocumentMouseUp, false );
renderer.domElement.addEventListener( 'mouseout', onDocumentMouseOut, false );
mouseXOnMouseDown = event.clientX - windowHalfX;
targetRotationOnMouseDown = targetRotation;
}
function onDocumentMouseMove( event ) {
event.preventDefault();
mouseX = event.clientX - windowHalfX;
targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.02;
}
function onDocumentMouseUp( event ) {
event.preventDefault();
renderer.domElement.removeEventListener( 'mousemove', onDocumentMouseMove, false );
renderer.domElement.removeEventListener( 'mouseup', onDocumentMouseUp, false );
renderer.domElement.removeEventListener( 'mouseout', onDocumentMouseOut, false );
}
function onDocumentMouseOut( event ) {
event.preventDefault();
renderer.domElement.removeEventListener( 'mousemove', onDocumentMouseMove, false );
renderer.domElement.removeEventListener( 'mouseup', onDocumentMouseUp, false );
renderer.domElement.removeEventListener( 'mouseout', onDocumentMouseOut, false );
}
function onDocumentTouchStart( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX;
targetRotationOnMouseDown = targetRotation;
}
}
function onDocumentTouchMove( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.05;
}
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
setRenderTargetSize();
scene.update();
var renderScene = scene.getScene();
renderModel.scene = renderScene;
renderer.setClearColor( renderScene.fog.color );
camera.aspect = renderer.domElement.clientWidth / renderer.domElement.clientHeight;
camera.updateProjectionMatrix();
camera.lookAt( cameraTarget );
renderer.clear();
if ( postprocessing.enabled ) {
composer.render( 0.05 );
} else {
renderer.render( renderScene, camera );
}
}
</script>
</body>
</html>