材质种类
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MeshBasicMaterial：为几何体赋予一种简单的颜色，或者显示几何体的线框
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MeshDepthMaterial：根据网格到相机的距离，该材质决定如何给网格染色
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MeshNormalMaterial：根据物体表面的法向量计算颜色
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MeshFaceMaterial：这是一种容器，可以在该容器中为物体的各个表面上设置不同的颜色
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MeshLambertMaterial：考虑光照的影响，可以创建颜色暗淡，不光亮的物体
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MeshPhongMaterial：考虑光照的影响，可以创建光亮的物体
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ShaderMaterial：使用自定义的着色器程序，直接控制顶点的放置方式，以及像素的着色方式。
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LineBasicMaterial：可以用于THREE.Line几何体，从而创建着色的直线
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LineDashedMaterial：类似与基础材质，但可以创建虚线效果
基本图形
//立方体
var cubeGeometry = new THREE.BoxGeometry(15,15,15,1,1,1);
var cubeMaterial = new THREE.MeshNormalMaterial({wireframe : true}); //材质
cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
var border = new THREE.EdgesHelper( cube,0xffff00 ); //添加边框
scene.add(cube);
scene.add(border);
//圆柱体
var cylinderGeometry = new THREE.CylinderGeometry(8, 8,10,30,30);
var cylinderMaterial = new THREE.MeshNormalMaterial();
var cylinder = new THREE.Mesh(cylinderGeometry,cylinderMaterial);
cylinder.position.x = -10;
cylinder.position.y = -5;
cylinder.position.z = 25;
cylinder.castShadow = true;
scene.add(cylinder);
//球体
var sphereGeometry = new THREE.SphereGeometry(7, 25, 25);
var sphereMaterial = new THREE.MeshLambertMaterial({color: 0x7777ff});
var sphere = new THREE.Mesh(sphereGeometry, sphereMaterial);
// position the sphere
sphere.position.x = 0;
sphere.position.y = 0;
sphere.position.z = 0;
sphere.castShadow = true;
// add the sphere to the scene
scene.add(sphere);
//圆环
var torusGeometry = new THREE.TorusGeometry(10,3,20,20);
var torusMaterial = new THREE.MeshBasicMaterial();
var tours = new THREE.Mesh(torusGeometry,torusMaterial);
tours.position.x = 10;
tours.position.y = -10;
tours.position.z = -40;
tours.castShadow = true;
scene.add(tours);我们通过position属性
