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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 - vfx flames</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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+
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+ <div id="info">
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+ <a href="https://threejs.org" target="_blank" rel="noopener">three.js webgpu</a> - vfx flames
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+ <br>
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+ Inspired by <a href="https://x.com/cmzw_/status/1799648702338158747" target="_blank" rel="noopener">@cmzw_</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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+ "three": "../build/three.webgpu.js",
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+ "three/tsl": "../build/three.webgpu.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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+
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+ <script type="module">
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+
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+ import * as THREE from 'three';
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+ import { PI2, dot, sin, step, texture, timerLocal, tslFn, uv, vec2, vec3, vec4, mix } from 'three/tsl';
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+
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+ import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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+
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+ let camera, scene, renderer, controls;
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+
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+ init();
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+
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+ function init() {
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+
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+ camera = new THREE.PerspectiveCamera( 25, window.innerWidth / window.innerHeight, 0.1, 100 );
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+ camera.position.set( 1, 1, 3 );
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+
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+ scene = new THREE.Scene();
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+ scene.background = new THREE.Color( 0x201919 );
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+
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+ // textures
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+
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+ const textureLoader = new THREE.TextureLoader();
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+
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+ const cellularTexture = textureLoader.load( './textures/noises/voronoi/grayscale-256x256.png' );
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+ const perlinTexture = textureLoader.load( './textures/noises/perlin/rgb-256x256.png' );
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+
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+ // TSL functions
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+
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+ const spherizeUv = tslFn( ( [ input, center, strength, offset ] ) => {
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+
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+ const delta = input.sub( center );
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+ const delta2 = dot( delta, delta );
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+ const delta4 = delta2.mul( delta2 );
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+ const deltaOffset = delta4.mul( strength );
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+ return input.add( delta.mul( deltaOffset ) ).add( offset );
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+
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+ } );
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+
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+ // gradient canvas
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+
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+ const gradient = {};
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+ gradient.element = document.createElement( 'canvas' );
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+ gradient.element.width = 128;
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+ gradient.element.height = 1;
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+ gradient.context = gradient.element.getContext( '2d' );
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+
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+ gradient.colors = [
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+ '#090033',
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+ '#5f1f93',
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+ '#e02e96',
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+ '#ffbd80',
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+ '#fff0db',
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+ ];
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+
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+ gradient.texture = new THREE.CanvasTexture( gradient.element );
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+ gradient.texture.colorSpace = THREE.SRGBColorSpace;
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+
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+ gradient.update = () => {
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+
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+ const fillGradient = gradient.context.createLinearGradient( 0, 0, gradient.element.width, 0 );
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+
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+ for ( let i = 0; i < gradient.colors.length; i ++ ) {
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+
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+ const progress = i / ( gradient.colors.length - 1 );
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+ const color = gradient.colors[ i ];
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+ fillGradient.addColorStop( progress, color );
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+
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+ }
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+
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+ gradient.context.fillStyle = fillGradient;
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+ gradient.context.fillRect( 0, 0, gradient.element.width, gradient.element.height );
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+
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+ gradient.texture.needsUpdate = true;
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+
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+ };
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+
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+ gradient.update();
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+
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+ // flame 1 material
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+
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+ const flame1Material = new THREE.MeshBasicNodeMaterial( { transparent: true, side: THREE.DoubleSide } );
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+
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+ flame1Material.colorNode = tslFn( () => {
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+
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+ const time = timerLocal();
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+
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+ // main UV
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+ const mainUv = uv().toVar();
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+ mainUv.assign( spherizeUv( mainUv, vec2( 0.5 ), 10, vec2( 0 ) ).mul( 0.6 ).add( 0.2 ) ); // spherize
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+ mainUv.assign( mainUv.pow( vec2( 1, 2 ) ) ); // stretch
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+ mainUv.assign( mainUv.mul( 2, 1 ).sub( vec2( 0.5, 0 ) ) ); // scale
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+
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+ // gradients
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+ const gradient1 = sin( time.mul( 10 ).sub( mainUv.y.mul( PI2 ).mul( 2 ) ) ).toVar();
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+ const gradient2 = mainUv.y.smoothstep( 0, 1 ).toVar();
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+ mainUv.x.addAssign( gradient1.mul( gradient2 ).mul( 0.2 ) );
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+
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+ // cellular noise
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+ const cellularUv = mainUv.mul( 0.5 ).add( vec2( 0, time.negate().mul( 0.5 ) ) ).mod( 1 );
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+ const cellularNoise = texture( cellularTexture, cellularUv, 0 ).r.oneMinus().smoothstep( 0, 0.5 ).oneMinus();
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+ cellularNoise.mulAssign( gradient2 );
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+
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+ // shape
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+ const shape = mainUv.sub( 0.5 ).mul( vec2( 3, 2 ) ).length().oneMinus().toVar();
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+ shape.assign( shape.sub( cellularNoise ) );
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+
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+ // gradient color
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+ const gradientColor = texture( gradient.texture, vec2( shape.remap( 0, 1, 0, 1 ), 0 ) );
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+
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+ // output
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+ const color = mix( gradientColor, vec3( 1 ), shape.step( 0.8 ).oneMinus() );
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+ const alpha = shape.smoothstep( 0, 0.3 );
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+ return vec4( color.rgb, alpha );
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+
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+ } )();
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+
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+ // flame 2 material
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+
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+ const flame2Material = new THREE.MeshBasicNodeMaterial( { transparent: true, side: THREE.DoubleSide } );
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+
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+ flame2Material.colorNode = tslFn( () => {
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+
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+ const time = timerLocal();
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+
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+ // main UV
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+ const mainUv = uv().toVar();
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+ mainUv.assign( spherizeUv( mainUv, vec2( 0.5 ), 10, vec2( 0 ) ).mul( 0.6 ).add( 0.2 ) ); // spherize
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+ mainUv.assign( mainUv.pow( vec2( 1, 3 ) ) ); // stretch
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+ mainUv.assign( mainUv.mul( 2, 1 ).sub( vec2( 0.5, 0 ) ) ); // scale
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+
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+ // perlin noise
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+ const perlinUv = mainUv.add( vec2( 0, time.negate().mul( 1 ) ) ).mod( 1 );
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+ const perlinNoise = texture( perlinTexture, perlinUv, 0 ).sub( 0.5 ).mul( 1 );
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+ mainUv.x.addAssign( perlinNoise.x.mul( 0.5 ) );
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+
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+ // gradients
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+ const gradient1 = sin( time.mul( 10 ).sub( mainUv.y.mul( PI2 ).mul( 2 ) ) );
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+ const gradient2 = mainUv.y.smoothstep( 0, 1 );
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+ const gradient3 = mainUv.y.smoothstep( 1, 0.7 );
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+ mainUv.x.addAssign( gradient1.mul( gradient2 ).mul( 0.2 ) );
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+
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+ // displaced perlin noise
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+ const displacementPerlinUv = mainUv.mul( 0.5 ).add( vec2( 0, time.negate().mul( 0.25 ) ) ).mod( 1 );
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+ const displacementPerlinNoise = texture( perlinTexture, displacementPerlinUv, 0 ).sub( 0.5 ).mul( 1 );
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+ const displacedPerlinUv = mainUv.add( vec2( 0, time.negate().mul( 0.5 ) ) ).add( displacementPerlinNoise ).mod( 1 );
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+ const displacedPerlinNoise = texture( perlinTexture, displacedPerlinUv, 0 ).sub( 0.5 ).mul( 1 );
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+ mainUv.x.addAssign( displacedPerlinNoise.mul( 0.5 ) );
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+
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+ // cellular noise
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+ const cellularUv = mainUv.add( vec2( 0, time.negate().mul( 1.5 ) ) ).mod( 1 );
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+ const cellularNoise = texture( cellularTexture, cellularUv, 0 ).r.oneMinus().smoothstep( 0.25, 1 );
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+
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+ // shape
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+ const shape = mainUv.sub( 0.5 ).mul( vec2( 6, 1 ) ).length().step( 0.5 );
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+ shape.assign( shape.mul( cellularNoise ) );
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+ shape.mulAssign( gradient3 );
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+ shape.assign( step( 0.01, shape ) );
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+
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+ // output
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+ return vec4( vec3( 1 ), shape );
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+
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+ } )();
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+
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+ // geometry
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+
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+ const geometry = new THREE.PlaneGeometry( 1, 1, 64, 64 );
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+
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+ // meshes
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+
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+ const flame1 = new THREE.Mesh( geometry, flame1Material );
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+ flame1.position.x = - 0.5;
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+ scene.add( flame1 );
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+
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+ const flame2 = new THREE.Mesh( geometry, flame2Material );
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+ flame2.position.x = 0.5;
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+ scene.add( flame2 );
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+
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+ // renderer
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+
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+ renderer = new THREE.WebGPURenderer( { antialias: true } );
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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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+
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+ controls = new OrbitControls( camera, renderer.domElement );
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+ controls.enableDamping = true;
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+ controls.minDistance = 0.1;
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+ controls.maxDistance = 50;
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+
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+ window.addEventListener( 'resize', onWindowResize );
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ async function animate() {
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+
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+ controls.update();
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+
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+ renderer.render( scene, camera );
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+
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+ }
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+
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+ </script>
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+ </body>
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+</html>
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Bruno Simon
