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chpt-3-2-Geometry.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>几何形状Geometry</title>
<script type="text/javascript" src="js/three.js"></script>
</head>
<body onload="init()">
<script>
function init(){
//而如果想要Three.js生成Canvas元素，在HTML中就不需要定义Canvas元素，在JavaScript代码中可以这样写：
var renderer = new THREE.WebGLRenderer();
renderer.setSize(800, 600);
document.getElementsByTagName('body')[0].appendChild(renderer.domElement);
//设置渲染器的背景色
renderer.setClearColor(0x000000);
//创建场景
var scene = new THREE.Scene();
//正交投影照相机（Orthographic Camera）设置起来较为直观，它的构造函数是：THREE.OrthographicCamera(left, right, top, bottom, near, far)
//var camera = new THREE.OrthographicCamera(-1, 3, 1.5, -1.5, 1, 10);
var camera = new THREE.OrthographicCamera(-2, 2, 1.5, -1.5, 1, 10);
camera.position.set(3, -3, 6);
camera.lookAt(new THREE.Vector3(0, 0, 0));
scene.add(camera);
//4.圆形（CircleGeometry）可以创建圆形或者扇形，其构造函数是：THREE.CircleGeometry(radius, segments, thetaStart, thetaLength)
var cube = new THREE.Mesh(new THREE.CircleGeometry(1.2, 20, Math.PI / 3, Math.PI / 3 * 4),
new THREE.MeshBasicMaterial({
color: 0xff0000,
wireframe: true
})
);
cube.position.x = -0.9;
scene.add(cube);
//5.圆柱体（CylinderGeometry）的构造函数是：THREE.CylinderGeometry(radiusTop,radiusBottom,height, radiusSegments, heightSegments, openEnded)
var cube1 = new THREE.Mesh(new THREE.CylinderGeometry(0.5,0.5,1,18,3),
new THREE.MeshBasicMaterial({
color:0xff00ff,
wireframe: true
})
);
cube1.position.x = 1.5;
cube1.position.y = -1;
scene.add(cube1);
//6.正四面体（TetrahedronGeometry)、正八面体(OctahedronGeometry)、正二十面体（IcosahedronGeometry)的构造函数较为类似，分别为
//THREE.TetrahedronGeometry(radius,detail)
//THREE.OctahedronGeometry(radius,detail)
//THREE.IcosahedronGeometry(radius,detail)
var cube2 = new THREE.Mesh(new THREE.IcosahedronGeometry(0.7),
new THREE.MeshBasicMaterial({
color:0x00ffff,
wireframe: true
})
);
cube2.position.x = 0.5;
cube2.position.y = 0.4;
scene.add(cube2);
//在定义了场景中的物体，设置好的照相机之后，渲染器就知道如何渲染出二维的结果了。这时候，我们只需要调用渲染器的渲染函数，就能使其渲染一次了。
renderer.render(scene, camera);
}
</script>
</body>
</html>