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类似境面反射可以使用CubeCamera但是CubeCamera更适用于创建物体自身对环境的反射，但是如果想要创建一面镜子的话使用CubeCamera会难调试所反射物体的位置，而且镜面中的物体不会随着控制器的缩放而变动。
使用Reflector.js可以很容易的创建一面镜子，并且镜子中的对象会依据发光体的缩放而缩放，而且可以调试镜子的发光色，类似墨镜的效果。
2、使用步骤
2.1、引入js文件
和创建镜头炫光 Lensflare一样需要单独引入
<!-- 导入 Reflector.js -->
<script src="../../libs/examples/js/objects/Reflector.js"></script>2.2、创建镜子形状
let planeGeometry = new THREE.PlaneBufferGeometry(10, 10);此处创建了一个矩形的平面
2.3、配置镜子参数
let options = {clipBias: 0.03,textureWidth: window.innerWidth * window.devicePixelRatio,textureHeight: window.innerHeight * window.devicePixelRatio,color: 0x889999,recursion: 1};
2.4、创建镜子并加入场景
let mirror = new THREE.Reflector(planeGeometry, options);
scene.add(mirror);3、示例代码
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<head><meta charset="UTF-8"><link rel="icon" href="../../../three.png"><title>通过 Reflector 创建反光镜</title><style>body {margin: 0;overflow: hidden; /* 溢出隐藏 */}#loading {position: fixed;top: 50%;left: 50%;color: #FFFFFF;font-size: 20px;margin-top: -30px;margin-left: -40px;}</style><script src="../../libs/build/three-r93.js"></script><script src="../../libs/examples/js/Detector.js"></script><script src="../../libs/examples/js/libs/dat.gui.min.js"></script><script src="../../libs/examples/js/libs/stats.min.js"></script><script src="../../libs/examples/js/controls/OrbitControls.js"></script><!-- 导入 Reflector.js --><script src="../../libs/examples/js/objects/Reflector.js"></script></head>
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<p id="loading">loading......</p>
<script>let scene, camera, renderer, controls, guiControls;let stats = initStats();/* 场景 */function initScene() {scene = new THREE.Scene();scene.background = new THREE.CubeTextureLoader().setPath('../../textures/cube/Bridge2/').load(['posx.jpg','negx.jpg','posy.jpg','negy.jpg','posz.jpg','negz.jpg']);}/* 相机 */function initCamera() {camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 10000);camera.position.set(-10, 2, 20);camera.lookAt(new THREE.Vector3(0, 0, 0));}/* 渲染器 */function initRender() {renderer = new THREE.WebGLRenderer({antialias: true});renderer.setSize(window.innerWidth, window.innerHeight);document.body.appendChild(renderer.domElement);}/* 灯光 */function initLight() {scene.add(new THREE.AmbientLight(0x0c0c0c));let spotLight1 = new THREE.SpotLight(0xffffff);spotLight1.position.set(-400, -400, -400);let spotLight2 = new THREE.SpotLight(0xffffff);spotLight2.position.set(400, 400, 400);scene.add(spotLight1);scene.add(spotLight2);}/* 控制器 */function initControls() {/* 地图控件 */controls = new THREE.OrbitControls(camera, renderer.domElement);/* 属性参数 */}/* 调试插件 */function initGui() {guiControls = new function () {};let gui = new dat.GUI();}/* 场景中的内容 */let mesh;function initContent() {let loader = new THREE.JSONLoader();loader.load('../../models/json/uv-standard.json', function (geometry) {let material = new THREE.MeshBasicMaterial();let texture = new THREE.TextureLoader().load('../../textures/uv/ash_uvgrid01.jpg');material.map = texture;mesh = new THREE.Mesh(geometry, material);mesh.translateZ(5);scene.add(mesh);removeLoading();});let planeGeometry = new THREE.PlaneBufferGeometry(10, 10);let options = {clipBias: 0.03,textureWidth: window.innerWidth * window.devicePixelRatio,textureHeight: window.innerHeight * window.devicePixelRatio,color: 0x889999,recursion: 1};let mirror = new THREE.Reflector(planeGeometry, options);scene.add(mirror);}/* 移除加载元素 */function removeLoading() {document.getElementById('loading').style.display = 'none';}/* 性能插件 */function initStats() {let stats = new Stats();document.body.appendChild(stats.domElement);return stats;}/* 窗口变动触发 */function onWindowResize() {camera.aspect = window.innerWidth / window.innerHeight;camera.updateProjectionMatrix();renderer.setSize(window.innerWidth, window.innerHeight);}/* 数据更新 */function update() {stats.update();controls.update();if (mesh) {mesh.rotateX(0.01);mesh.rotateY(0.01);mesh.rotateZ(0.01);}}/* 初始化 */function init() {initScene();initCamera();initRender();initLight();initControls();initContent();initGui();/* 监听事件 */window.addEventListener('resize', onWindowResize, false);}/* 循环渲染 */function animate() {requestAnimationFrame(animate);renderer.render(scene, camera);update();}/* 初始加载 */(function () {console.log("three init start...");init();animate();console.log("three init end...");})();</script>
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