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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgpu - vfx flames</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 webgpu</a> - vfx flames
- <br>
- Inspired by <a href="https://x.com/cmzw_/status/1799648702338158747" target="_blank" rel="noopener">@cmzw_</a>
- </div>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.webgpu.js",
- "three/tsl": "../build/three.webgpu.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { PI2, oneMinus, spherizeUV, sin, step, texture, timerLocal, Fn, uv, vec2, vec3, vec4, mix, billboarding } from 'three/tsl';
- import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- let camera, scene, renderer, controls;
- init();
- function init() {
- camera = new THREE.PerspectiveCamera( 25, window.innerWidth / window.innerHeight, 0.1, 100 );
- camera.position.set( 1, 1, 3 );
- scene = new THREE.Scene();
- scene.background = new THREE.Color( 0x201919 );
- // textures
- const textureLoader = new THREE.TextureLoader();
- const cellularTexture = textureLoader.load( './textures/noises/voronoi/grayscale-256x256.png' );
- const perlinTexture = textureLoader.load( './textures/noises/perlin/rgb-256x256.png' );
- // gradient canvas
- const gradient = {};
- gradient.element = document.createElement( 'canvas' );
- gradient.element.width = 128;
- gradient.element.height = 1;
- gradient.context = gradient.element.getContext( '2d' );
- gradient.colors = [
- '#090033',
- '#5f1f93',
- '#e02e96',
- '#ffbd80',
- '#fff0db',
- ];
- gradient.texture = new THREE.CanvasTexture( gradient.element );
- gradient.texture.colorSpace = THREE.SRGBColorSpace;
- gradient.update = () => {
- const fillGradient = gradient.context.createLinearGradient( 0, 0, gradient.element.width, 0 );
- for ( let i = 0; i < gradient.colors.length; i ++ ) {
- const progress = i / ( gradient.colors.length - 1 );
- const color = gradient.colors[ i ];
- fillGradient.addColorStop( progress, color );
- }
- gradient.context.fillStyle = fillGradient;
- gradient.context.fillRect( 0, 0, gradient.element.width, gradient.element.height );
- gradient.texture.needsUpdate = true;
- };
- gradient.update();
- // flame 1 material
- const flame1Material = new THREE.SpriteNodeMaterial( { transparent: true, side: THREE.DoubleSide } );
- flame1Material.colorNode = Fn( () => {
- const time = timerLocal();
- // main UV
- const mainUv = uv().toVar();
- mainUv.assign( spherizeUV( mainUv, 10 ).mul( 0.6 ).add( 0.2 ) ); // spherize
- mainUv.assign( mainUv.pow( vec2( 1, 2 ) ) ); // stretch
- mainUv.assign( mainUv.mul( 2, 1 ).sub( vec2( 0.5, 0 ) ) ); // scale
- // gradients
- const gradient1 = sin( time.mul( 10 ).sub( mainUv.y.mul( PI2 ).mul( 2 ) ) ).toVar();
- const gradient2 = mainUv.y.smoothstep( 0, 1 ).toVar();
- mainUv.x.addAssign( gradient1.mul( gradient2 ).mul( 0.2 ) );
- // cellular noise
- const cellularUv = mainUv.mul( 0.5 ).add( vec2( 0, time.negate().mul( 0.5 ) ) ).mod( 1 );
- const cellularNoise = texture( cellularTexture, cellularUv, 0 ).r.oneMinus().smoothstep( 0, 0.5 ).oneMinus();
- cellularNoise.mulAssign( gradient2 );
- // shape
- const shape = mainUv.sub( 0.5 ).mul( vec2( 3, 2 ) ).length().oneMinus().toVar();
- shape.assign( shape.sub( cellularNoise ) );
- // gradient color
- const gradientColor = texture( gradient.texture, vec2( shape.remap( 0, 1, 0, 1 ), 0 ) );
- // output
- const color = mix( gradientColor, vec3( 1 ), shape.step( 0.8 ).oneMinus() );
- const alpha = shape.smoothstep( 0, 0.3 );
- return vec4( color.rgb, alpha );
- } )();
- // flame 2 material
- const flame2Material = new THREE.SpriteNodeMaterial( { transparent: true, side: THREE.DoubleSide } );
- flame2Material.colorNode = Fn( () => {
- const time = timerLocal();
- // main UV
- const mainUv = uv().toVar();
- mainUv.assign( spherizeUV( mainUv, 10 ).mul( 0.6 ).add( 0.2 ) ); // spherize
- mainUv.assign( mainUv.pow( vec2( 1, 3 ) ) ); // stretch
- mainUv.assign( mainUv.mul( 2, 1 ).sub( vec2( 0.5, 0 ) ) ); // scale
- // perlin noise
- const perlinUv = mainUv.add( vec2( 0, time.negate().mul( 1 ) ) ).mod( 1 );
- const perlinNoise = texture( perlinTexture, perlinUv, 0 ).sub( 0.5 ).mul( 1 );
- mainUv.x.addAssign( perlinNoise.x.mul( 0.5 ) );
- // gradients
- const gradient1 = sin( time.mul( 10 ).sub( mainUv.y.mul( PI2 ).mul( 2 ) ) );
- const gradient2 = mainUv.y.smoothstep( 0, 1 );
- const gradient3 = oneMinus( mainUv.y ).smoothstep( 0, 0.3 );
- mainUv.x.addAssign( gradient1.mul( gradient2 ).mul( 0.2 ) );
- // displaced perlin noise
- const displacementPerlinUv = mainUv.mul( 0.5 ).add( vec2( 0, time.negate().mul( 0.25 ) ) ).mod( 1 );
- const displacementPerlinNoise = texture( perlinTexture, displacementPerlinUv, 0 ).sub( 0.5 ).mul( 1 );
- const displacedPerlinUv = mainUv.add( vec2( 0, time.negate().mul( 0.5 ) ) ).add( displacementPerlinNoise ).mod( 1 );
- const displacedPerlinNoise = texture( perlinTexture, displacedPerlinUv, 0 ).sub( 0.5 ).mul( 1 );
- mainUv.x.addAssign( displacedPerlinNoise.mul( 0.5 ) );
- // cellular noise
- const cellularUv = mainUv.add( vec2( 0, time.negate().mul( 1.5 ) ) ).mod( 1 );
- const cellularNoise = texture( cellularTexture, cellularUv, 0 ).r.oneMinus().smoothstep( 0.25, 1 );
- // shape
- const shape = mainUv.sub( 0.5 ).mul( vec2( 6, 1 ) ).length().step( 0.5 );
- shape.assign( shape.mul( cellularNoise ) );
- shape.mulAssign( gradient3 );
- shape.assign( step( 0.01, shape ) );
- // output
- return vec4( vec3( 1 ), shape );
- } )();
- // billboarding - follow the camera rotation only horizontally
- flame1Material.vertexNode = billboarding();
- flame2Material.vertexNode = billboarding();
- // meshes
- const flame1 = new THREE.Sprite( flame1Material );
- flame1.center.set( 0.5, 0 );
- flame1.scale.x = 0.5; // optional
- flame1.position.x = - 0.5;
- scene.add( flame1 );
- const flame2 = new THREE.Sprite( flame2Material );
- flame2.center.set( 0.5, 0 );
- flame2.position.x = 0.5;
- scene.add( flame2 );
- // renderer
- renderer = new THREE.WebGPURenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.setAnimationLoop( animate );
- document.body.appendChild( renderer.domElement );
- controls = new OrbitControls( camera, renderer.domElement );
- controls.enableDamping = true;
- controls.minDistance = 0.1;
- controls.maxDistance = 50;
- window.addEventListener( 'resize', onWindowResize );
- }
- function onWindowResize() {
- camera.aspect = window.innerWidth / window.innerHeight;
- camera.updateProjectionMatrix();
- renderer.setSize( window.innerWidth, window.innerHeight );
- }
- async function animate() {
- controls.update();
- renderer.render( scene, camera );
- }
- </script>
- </body>
- </html>
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