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添加光影效果主要用到的代码如下：
//使渲染器支持阴影贴图 THREE.Render.shadowMapEnabled= true; //设置灯光阴影属性 //设置灯光生成阴影 THREE.Light.castShadow= true; //如果是调试状态，还可以把灯光的调试帮助框显示出来 THREE.Light.shadowCameraVisible= true; //设置阴影贴图质量 THREE.Light.shadowMapWidth = THREE.Light.shadowMapHeight = 1024*4; //设置模型属性 //设置物体生成阴影 THREE.Mesh.castShadow = true; //设置物体接收阴影，即其它物体的阴影可以显示在该物体上 THREE.Mesh.receiveShadow= true;
完整的测试代码如下：
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script src="ThreeJS/build/three.js"></script>
<script src="ThreeJS/examples/js/controls/OrbitControls.js"></script>
<script src="ThreeJS/examples/js/loaders/OBJMTLLoader.js"></script>
<script src="ThreeJS/examples/js/loaders/MTLLoader.js"></script>
<script>
var _scene,_camera,_control,_render,_ambient,_spotLight;
Init();
Animate();
function Init()
{
_scene = new THREE.Scene();
_camera = new THREE.PerspectiveCamera(45,window.innerWidth/window.innerHeight,0.1,2000);
_camera.position.z = 50;
_render = new THREE.WebGLRenderer();
//设置渲染器大小
_render.setSize(window.innerWidth,window.innerHeight);
//设置渲染器阴影可用
_render.shadowMapEnabled = true;
document.body.appendChild(_render.domElement);
//场景控制器，用以控制场景中的摄相机，方便观察场景
_control = new THREE.OrbitControls(_camera,_render.domElement);
//添加环境光
_ambient = new THREE.AmbientLight(0xffffff);
_scene.add(_ambient);
//灯光属性
_spotLight = new THREE.SpotLight(0xffffff);
_spotLight.castShadow = true;
_spotLight.shadowCameraVisible = true;
_spotLight.position.set(100,100,100);
//设置阴影贴图精度
_spotLight.shadowMapWidth = _spotLight.shadowMapHeight = 1024*4;
_scene.add(_spotLight);
//加载模型
LoadModel();
}
function Animate()
{
requestAnimationFrame(Animate);
Render();
}
function Render()
{
//更新摄相机角度
_control.update();
_render.render(_scene,_camera);
}
function LoadModel()
{
//调用OBJMTLLoader加载模型
var loader = new THREE.OBJMTLLoader();
loader.load(‘Model/tc_tm/tc.obj‘,‘Model/tc_tm/tc.mtl‘,
function(obj)
{
//traverse：回调，该模型以及所有子模型均执行该函数
//相当于遍历obj的children数组
obj.traverse(function(child)
{
if (child instanceof THREE.Mesh)
{
//设置模型生成阴影并接收阴影
child.castShadow = true;
child.receiveShadow = true;
}
});
_scene.add(obj);
});
}
</script>
</body>
</html>
效果如下图所示：
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原文地址：http://www.cnblogs.com/cll131421/p/4468466.html
