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three.js
镜像来自 https://github.com/mrdoob/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - postprocessing - unreal bloom selective</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="main.css">
	</head>
	<body>

		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> Click on a sphere to toggle bloom<br>By <a href="http://github.com/Temdog007" target="_blank" rel="noopener">Temdog007</a>
		</div>

		<script type="x-shader/x-vertex" id="vertexshader">

			varying vec2 vUv;

			void main() {

				vUv = uv;

				gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

			}

		</script>

		<script type="x-shader/x-fragment" id="fragmentshader">

			uniform sampler2D baseTexture;
			uniform sampler2D bloomTexture;

			varying vec2 vUv;

			void main() {

				gl_FragColor = ( texture2D( baseTexture, vUv ) + vec4( 1.0 ) * texture2D( bloomTexture, vUv ) );

			}

		</script>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';

			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import { EffectComposer } from 'three/addons/postprocessing/EffectComposer.js';
			import { RenderPass } from 'three/addons/postprocessing/RenderPass.js';
			import { ShaderPass } from 'three/addons/postprocessing/ShaderPass.js';
			import { UnrealBloomPass } from 'three/addons/postprocessing/UnrealBloomPass.js';
			import { OutputPass } from 'three/addons/postprocessing/OutputPass.js';

			const BLOOM_SCENE = 1;

			const bloomLayer = new THREE.Layers();
			bloomLayer.set( BLOOM_SCENE );

			const params = {
				threshold: 0,
				strength: 1,
				radius: 0.5,
				exposure: 1
			};

			const darkMaterial = new THREE.MeshBasicMaterial( { color: 'black' } );
			const materials = {};

			const renderer = new THREE.WebGLRenderer( { antialias: true } );
			renderer.setPixelRatio( window.devicePixelRatio );
			renderer.setSize( window.innerWidth, window.innerHeight );
			renderer.toneMapping = THREE.ReinhardToneMapping;
			document.body.appendChild( renderer.domElement );

			const scene = new THREE.Scene();

			const camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 200 );
			camera.position.set( 0, 0, 20 );
			camera.lookAt( 0, 0, 0 );

			const controls = new OrbitControls( camera, renderer.domElement );
			controls.maxPolarAngle = Math.PI * 0.5;
			controls.minDistance = 1;
			controls.maxDistance = 100;
			controls.addEventListener( 'change', render );

			const renderScene = new RenderPass( scene, camera );

			const bloomPass = new UnrealBloomPass( new THREE.Vector2( window.innerWidth, window.innerHeight ), 1.5, 0.4, 0.85 );
			bloomPass.threshold = params.threshold;
			bloomPass.strength = params.strength;
			bloomPass.radius = params.radius;

			const bloomComposer = new EffectComposer( renderer );
			bloomComposer.renderToScreen = false;
			bloomComposer.addPass( renderScene );
			bloomComposer.addPass( bloomPass );

			const mixPass = new ShaderPass(
				new THREE.ShaderMaterial( {
					uniforms: {
						baseTexture: { value: null },
						bloomTexture: { value: bloomComposer.renderTarget2.texture }
					},
					vertexShader: document.getElementById( 'vertexshader' ).textContent,
					fragmentShader: document.getElementById( 'fragmentshader' ).textContent,
					defines: {}
				} ), 'baseTexture'
			);
			mixPass.needsSwap = true;

			const outputPass = new OutputPass();

			const finalComposer = new EffectComposer( renderer );
			finalComposer.addPass( renderScene );
			finalComposer.addPass( mixPass );
			finalComposer.addPass( outputPass );

			const raycaster = new THREE.Raycaster();

			const mouse = new THREE.Vector2();

			window.addEventListener( 'pointerdown', onPointerDown );

			const gui = new GUI();

			const bloomFolder = gui.addFolder( 'bloom' );

			bloomFolder.add( params, 'threshold', 0.0, 1.0 ).onChange( function ( value ) {

				bloomPass.threshold = Number( value );
				render();

			} );

			bloomFolder.add( params, 'strength', 0.0, 3 ).onChange( function ( value ) {

				bloomPass.strength = Number( value );
				render();

			} );

			bloomFolder.add( params, 'radius', 0.0, 1.0 ).step( 0.01 ).onChange( function ( value ) {

				bloomPass.radius = Number( value );
				render();

			} );

			const toneMappingFolder = gui.addFolder( 'tone mapping' );

			toneMappingFolder.add( params, 'exposure', 0.1, 2 ).onChange( function ( value ) {

				renderer.toneMappingExposure = Math.pow( value, 4.0 );
				render();

			} );

			setupScene();

			function onPointerDown( event ) {

				mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
				mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;

				raycaster.setFromCamera( mouse, camera );
				const intersects = raycaster.intersectObjects( scene.children, false );
				if ( intersects.length > 0 ) {

					const object = intersects[ 0 ].object;
					object.layers.toggle( BLOOM_SCENE );
					render();

				}

			}

			window.onresize = function () {

				const width = window.innerWidth;
				const height = window.innerHeight;

				camera.aspect = width / height;
				camera.updateProjectionMatrix();

				renderer.setSize( width, height );

				bloomComposer.setSize( width, height );
				finalComposer.setSize( width, height );

				render();

			};

			function setupScene() {

				scene.traverse( disposeMaterial );
				scene.children.length = 0;

				const geometry = new THREE.IcosahedronGeometry( 1, 15 );

				for ( let i = 0; i < 50; i ++ ) {

					const color = new THREE.Color();
					color.setHSL( Math.random(), 0.7, Math.random() * 0.2 + 0.05 );

					const material = new THREE.MeshBasicMaterial( { color: color } );
					const sphere = new THREE.Mesh( geometry, material );
					sphere.position.x = Math.random() * 10 - 5;
					sphere.position.y = Math.random() * 10 - 5;
					sphere.position.z = Math.random() * 10 - 5;
					sphere.position.normalize().multiplyScalar( Math.random() * 4.0 + 2.0 );
					sphere.scale.setScalar( Math.random() * Math.random() + 0.5 );
					scene.add( sphere );

					if ( Math.random() < 0.25 ) sphere.layers.enable( BLOOM_SCENE );

				}

				render();

			}

			function disposeMaterial( obj ) {

				if ( obj.material ) {

					obj.material.dispose();

				}

			}

			function render() {

				scene.traverse( darkenNonBloomed );
				bloomComposer.render();
				scene.traverse( restoreMaterial );

				// render the entire scene, then render bloom scene on top
				finalComposer.render();

			}

			function darkenNonBloomed( obj ) {

				if ( obj.isMesh && bloomLayer.test( obj.layers ) === false ) {

					materials[ obj.uuid ] = obj.material;
					obj.material = darkMaterial;

				}

			}

			function restoreMaterial( obj ) {

				if ( materials[ obj.uuid ] ) {

					obj.material = materials[ obj.uuid ];
					delete materials[ obj.uuid ];

				}

			}

		</script>

	</body>

</html>