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@@ -7,6 +7,12 @@
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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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+
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<script type="importmap">
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{
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"imports": {
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@@ -21,62 +27,145 @@
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<script type="module">
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import * as THREE from 'three';
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- import { pass } from 'three/tsl';
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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;
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- let mesh, postProcessing, combinedPass;
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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: 0.96
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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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- createGUI();
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function init() {
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- renderer = new THREE.WebGPURenderer( { antialias: true } );
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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( 70, window.innerWidth / window.innerHeight, 1, 1000 );
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- camera.position.z = 400;
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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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- scene.fog = new THREE.Fog( 0x000000, 1, 1000 );
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- const geometry = new THREE.TorusKnotGeometry( 100, 30, 100, 16 );
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- const material = new THREE.MeshNormalMaterial();
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- mesh = new THREE.Mesh( geometry, material );
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- scene.add( mesh );
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+ const sprite = new THREE.TextureLoader().load( 'textures/sprites/circle.png' );
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+
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+ // geometry
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+
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+ const radius = 600;
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+ const count = 50000;
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+
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+ const vertex = new THREE.Vector3();
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+ const color = new THREE.Color();
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+
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+ const colors = [];
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+ const vertices = [];
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+ const timeOffsets = [];
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+
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+ for ( var i = 0; i < count; i ++ ) {
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+
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+ getRandomPointOnSphere( radius, vertex );
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+ vertices.push( vertex.x, vertex.y, vertex.z );
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+
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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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+
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+ timeOffsets.push( i / count );
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+
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+ }
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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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+
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+ // material and TSL
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+
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+ const material = new THREE.SpriteNodeMaterial( { blending: THREE.AdditiveBlending, depthWrite: false, transparent: true } );
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+
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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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+
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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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+
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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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+
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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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+
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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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- const scenePass = pass( scene, camera );
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- const scenePassColor = scenePass.getTextureNode();
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+ scenePass = pass( scene, camera );
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+
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+ afterImagePass = afterImage( scenePass, params.damp );
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+
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+ postProcessing.outputNode = afterImagePass;
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- combinedPass = scenePassColor;
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- combinedPass = afterImage( combinedPass, params.damp );
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+ //
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- postProcessing.outputNode = combinedPass;
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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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+ //
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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 createGUI() {
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+ function updatePassChain() {
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- const gui = new GUI( { title: 'Damp setting' } );
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- gui.add( combinedPass.damp, 'value', 0, 1 ).step( 0.001 );
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+ if ( params.enabled === true ) {
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+
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+ postProcessing.outputNode = afterImagePass;
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+
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+ } else {
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+
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+ postProcessing.outputNode = scenePass;
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+
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+ }
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+
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+ postProcessing.needsUpdate = true;
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+
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+
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+ }
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+
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+
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+ function getRandomPointOnSphere( r, v ) {
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+
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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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+
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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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+
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+ return v;
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}
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@@ -89,19 +178,13 @@
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}
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- function render() {
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-
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- mesh.rotation.x += 0.0075;
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- mesh.rotation.y += 0.015;
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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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- }
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-
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- function animate() {
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-
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- render();
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+ stats.update();
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}
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Michael Herzog
