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194 lines
5.2 KiB
HTML
194 lines
5.2 KiB
HTML
2 months ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgpu - postprocessing afterimage</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - postprocessing - after image<br />
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Based on <a href="https://web.archive.org/web/20220629101314/http://oos.moxiecode.com/js_webgl/spiral/" target="_blank" rel="noopener">Particle Spiral</a>
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by <a href="https://github.com/oosmoxiecode" target="_blank" rel="noopener">oosmoxiecode</a>
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</div>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.webgpu.js",
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"three/webgpu": "../build/three.webgpu.js",
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"three/tsl": "../build/three.tsl.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import { instancedBufferAttribute, mod, pass, texture, float, time, vec2, vec3, vec4, sin, cos } from 'three/tsl';
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import { afterImage } from 'three/addons/tsl/display/AfterImageNode.js';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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import Stats from 'three/addons/libs/stats.module.js';
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let camera, scene, renderer, particles, stats;
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let postProcessing, afterImagePass, scenePass;
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const params = {
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damp: 0.8,
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enabled: true
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};
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init();
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function init() {
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renderer = new THREE.WebGPURenderer();
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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renderer.setAnimationLoop( animate );
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document.body.appendChild( renderer.domElement );
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camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 10000 );
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camera.position.z = 1000;
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scene = new THREE.Scene();
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const sprite = new THREE.TextureLoader().load( 'textures/sprites/circle.png' );
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// geometry
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const radius = 600;
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const count = 50000;
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const vertex = new THREE.Vector3();
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const color = new THREE.Color();
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const colors = [];
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const vertices = [];
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const timeOffsets = [];
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for ( var i = 0; i < count; i ++ ) {
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getRandomPointOnSphere( radius, vertex );
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vertices.push( vertex.x, vertex.y, vertex.z );
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color.setHSL( i / count, 0.7, 0.7, THREE.SRGBColorSpace );
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colors.push( color.r, color.g, color.b );
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timeOffsets.push( i / count );
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}
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const positionAttribute = new THREE.InstancedBufferAttribute( new Float32Array( vertices ), 3 );
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const colorAttribute = new THREE.InstancedBufferAttribute( new Float32Array( colors ), 3 );
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const timeAttribute = new THREE.InstancedBufferAttribute( new Float32Array( timeOffsets ), 1 );
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// material and TSL
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const material = new THREE.SpriteNodeMaterial( { blending: THREE.AdditiveBlending, depthWrite: false } );
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const localTime = instancedBufferAttribute( timeAttribute ).add( time.mul( 0.1 ) );
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const modTime = mod( localTime, 1.0 );
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const accTime = modTime.mul( modTime );
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const angle = accTime.mul( 40.0 );
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const pulse = vec2( sin( angle ).mul( 20.0 ), cos( angle ).mul( 20.0 ) );
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const pos = instancedBufferAttribute( positionAttribute );
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const animated = vec3( pos.x.mul( accTime ).add( pulse.x ), pos.y.mul( accTime ).add( pulse.y ), pos.z.mul( accTime ).mul( 1.75 ) );
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const fAlpha = modTime.oneMinus().mul( 2.0 );
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material.colorNode = texture( sprite ).mul( vec4( instancedBufferAttribute( colorAttribute ), fAlpha ) );
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material.positionNode = animated;
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material.scaleNode = float( 2 );
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particles = new THREE.Sprite( material );
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particles.count = count;
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scene.add( particles );
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// postprocessing
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postProcessing = new THREE.PostProcessing( renderer );
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scenePass = pass( scene, camera );
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afterImagePass = afterImage( scenePass, params.damp );
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postProcessing.outputNode = afterImagePass;
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//
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const gui = new GUI( { title: 'Damp setting' } );
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gui.add( afterImagePass.damp, 'value', 0.25, 1 );
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gui.add( params, 'enabled' ).onChange( updatePassChain );
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//
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stats = new Stats();
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document.body.appendChild( stats.dom );
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window.addEventListener( 'resize', onWindowResize );
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}
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function updatePassChain() {
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if ( params.enabled === true ) {
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postProcessing.outputNode = afterImagePass;
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} else {
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postProcessing.outputNode = scenePass;
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}
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postProcessing.needsUpdate = true;
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}
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function getRandomPointOnSphere( r, v ) {
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const angle = Math.random() * Math.PI * 2;
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const u = Math.random() * 2 - 1;
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v.set(
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Math.cos( angle ) * Math.sqrt( 1 - Math.pow( u, 2 ) ) * r,
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Math.sin( angle ) * Math.sqrt( 1 - Math.pow( u, 2 ) ) * r,
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u * r
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);
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return v;
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function animate( time ) {
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particles.rotation.z = time * 0.001;
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postProcessing.render();
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stats.update();
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}
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</script>
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</body>
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</html>
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