three.js实现分模块添加梦幻bloom辉光光晕方案--详细注释版本~~方案三版本~~

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先上图对比方案1-2-3不同点,本文是方案3

方案1(旋转场景情况下发光体不应该遮住另一个,但是遮住了)

方案2(层次正常,发光正常)

方案3(层次正常,发光正常,但是转动场景时候部分辉光会被遮挡,但是还算OK)

上代码,与方案1代码只有两行是不一样的哦

<!DOCTYPE html
  PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>bloomPass</title>
  <style>
    html,
    body {
      width: 100%;
      height: 100%;
      margin: 0;
      padding: 0;
      overflow: hidden;
    }

    #container {
      width: 100%;
      height: 100%;
    }
  </style>
</head>

<body>
  <div id="container"></div>
  <button onclick="getC()" style="position: absolute; top: 50px;">getC</button>
  <!-- <script src="js/three.min.js"></script> -->
  <script src="js/tween.js"></script>
  <!-- <script src="js/stats.min.js"></script> -->
  <!-- <script src="js/OrbitControls.js"></script> -->
  <!-- 后期处理js -->
  <!--  -->
  <!-- <script src="js/shaders/ConvolutionShader.js"></script> -->
  <!-- <script> -->
  <script type="module">
    import * as THREE from \'../build/three.module.js\';
    import Stats from \'./jsm/libs/stats.module.js\';
    import { GUI } from \'./jsm/libs/dat.gui.module.js\';
    import { OrbitControls } from \'./jsm/controls/OrbitControls.js\';
    import { EffectComposer } from \'./jsm/postprocessing/EffectComposer.js\'; // EffectComposer(效果组合器)对象
    import { RenderPass } from \'./jsm/postprocessing/RenderPass.js\'; // RenderPass/该通道在指定的场景和相机的基础上渲染出一个新场景
    import { ShaderPass } from \'./jsm/postprocessing/ShaderPass.js\'; // ShaderPass/使用该通道你可以传入一个自定义的着色器,用来生成高级的、自定义的后期处理通道
    import { CopyShader } from \'./jsm/shaders/CopyShader.js\'; // 传入了CopyShader着色器,用于拷贝渲染结果
    import { BloomPass } from \'./jsm/postprocessing/BloomPass.js\';
    import { UnrealBloomPass } from \'./jsm/postprocessing/UnrealBloomPass.js\'; // BloomPass/形成泛光的效果
    // 需要用官方版本的tween.js
    let container = document.getElementById(\'container\');
    let camera, scene, renderer;
    let cubeGroup, labelGroup = [];
    let stats, controls;
    let renderOrder = 1
		let bloomPass
    var params = {
			exposure: 1,
			bloomStrength: 1.5,
			bloomThreshold: 0,
			bloomRadius: 0
		};
    let bloomComposer = null
    init();
    update();
    function init() {
      // scene
      scene = new THREE.Scene();
      // camera
      let frustumSize = 150;
      let aspect = container.clientWidth / container.clientHeight;
      camera = new THREE.PerspectiveCamera(
        45,
        window.innerWidth / window.innerHeight,
        1,
        50000
      )
      camera.position.set(306, 1126, 7976);
      camera.lookAt(new THREE.Vector3(0, 0, 0));
      var ambientLight = new THREE.AmbientLight(\'#ffffff\', 0.7) // offline
      scene.add(ambientLight)
      // renderer
      renderer = new THREE.WebGLRenderer();
      renderer.autoClear = false
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setPixelRatio(window.devicePixelRatio);
      container.appendChild(renderer.domElement);
      renderer.render(scene, camera);
      addCubes()
      addBloomPass()
      stats = new Stats();
      container.appendChild(stats.dom);
      controls = new OrbitControls(camera, renderer.domElement);
      window.addEventListener(\'resize\', onWindowResize, false);
    }
    function update() {
      // controls.update();
      stats.update();
      // 渲染器清除颜色、深度或模板缓存. 此方法将颜色缓存初始化为当前颜色
      renderer.clear()
      camera.layers.set(1)
      if (bloomComposer) { bloomComposer.render() }
      // 清除深度缓存
      renderer.clearDepth()
      camera.layers.set(0)
      renderer.render(scene, camera)
      requestAnimationFrame(update);
    }
    function getC() {
      console.log(camera)
    }
    function onWindowResize() {
      let frustumSize = 200;
      let aspect = container.clientWidth / container.clientHeight;
      camera.left = frustumSize * aspect / -2;
      camera.right = frustumSize * aspect / 2;
      camera.top = frustumSize / 2;
      camera.bottom = frustumSize / -2;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    }
    
    function addBloomPass() {
      // RenderPass这个通道会渲染场景,但不会将渲染结果输出到屏幕上
      const renderScene = new RenderPass(scene, camera)
      const effectCopy = new ShaderPass(CopyShader); //传入了CopyShader着色器,用于拷贝渲染结果
      effectCopy.renderToScreen = true;
      // THREE.BloomPass(strength, kernelSize, sigma, Resolution)
      // strength 定义泛光效果的强度,值越高,明亮的区域越明亮,而且渗入较暗区域的也就越多
      // kernelSize 控制泛光的偏移量
      // sigma 控制泛光的锐利程度,值越高,泛光越模糊
      // Resolution 定义泛光的解析图,如果该值太低,结果的方块化就会越严重
      // const bloomPass = new BloomPass(2, 25, 4.0, 256); //BloomPass通道效果
      //创建效果组合器对象,可以在该对象上添加后期处理通道,通过配置该对象,使它可以渲染我们的场景,并应用额外的后期处理步骤,在render循环中,使用EffectComposer渲染场景、应用通道,并输出结果。
      bloomPass = new UnrealBloomPass(new THREE.Vector2(window.innerWidth, window.innerHeight), 1.5, 0.4,
				0.85);
			bloomPass.renderToScreen = true;
			bloomPass.threshold = params.bloomThreshold;
			bloomPass.strength = params.bloomStrength;
			bloomPass.radius = params.bloomRadius;
      
      bloomComposer = new EffectComposer(renderer)
      bloomComposer.setSize(window.innerWidth, window.innerHeight);
      bloomComposer.addPass(renderScene);
      bloomComposer.addPass(bloomPass);
      bloomComposer.addPass(effectCopy);
      bloomComposer.render()
    }
    function addCubes() {
      // 创建两个box, 将box进行layers进行分层是重要代码,camera默认渲染0层
      let texture = new THREE.TextureLoader().load("./img/backav9.jpg")
      let texture1 = new THREE.TextureLoader().load("./img/py.png")
      var geometry1 = new THREE.BoxGeometry(400, 400, 400);
      var material1 = new THREE.MeshBasicMaterial({
        map: texture
      });
      var cube1 = new THREE.Mesh(geometry1, material1);
      // 重要代码,将当前创建的box分配到0层
      // cube1.layers.set(1) // 和方案一仅仅只有这里不同
			cube1.layers.enable(1); // 分层
      cube1.position.set(1200, 0, 0)
      scene.add(cube1);
      var geometry2 = new THREE.BoxGeometry(400, 400, 400);
      var material2 = new THREE.MeshBasicMaterial({
        map: texture1
      });
      var cube2 = new THREE.Mesh(geometry2, material2);
      // 重要代码,将当前创建的box分配到1层
      // cube2.layers.set(0) // 和方案一仅仅只有这里不同
			cube2.layers.enable(0); // 分层
      cube2.position.set(600, 0, 0)
      scene.add(cube2);
    }
    function initGui() {
      var gui = new GUI();
			gui.add(params, \'exposure\', 0.1, 2).onChange(function (value) {
				renderer.toneMappingExposure = Math.pow(value, 4.0);
			});
			gui.add(params, \'bloomThreshold\', 0.0, 1.0).onChange(function (value) {
				bloomPass.threshold = Number(value);
			});
			gui.add(params, \'bloomStrength\', 0.0, 3.0).onChange(function (value) {
				bloomPass.strength = Number(value);
			});
			gui.add(params, \'bloomRadius\', 0.0, 1.0).step(0.01).onChange(function (value) {
				bloomPass.radius = Number(value);
			});
		}
    initGui()
  </script>
</body>

</html>

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