bloom分层渲染，同时支持光晕效果和普通材质（页面背景透明）-方案三
<!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>
原文：https://blog.csdn.net/tangdou369098655/article/details/117257687
WEBGL学习网 » bloom分层渲染，同时支持光晕效果和普通材质（页面背景透明）-方案三
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