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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 Tornado</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 Tornado
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+ <br>
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+ Based on <a href="https://threejs-journey.com/lessons/galaxy-generator" target="_blank" rel="noopener">Three.js Journey</a> lesson
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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 { luminance, cos, float, min, timerLocal, atan2, uniform, pass, bloom, PI, PI2, color, positionLocal, sin, texture, tslFn, uv, vec2, vec3, vec4 } from 'three/tsl';
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+
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+ import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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+ import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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+
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+ let camera, scene, renderer, postProcessing, 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, 50 );
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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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+
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+ // textures
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+
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+ const textureLoader = new THREE.TextureLoader();
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+ const perlinTexture = textureLoader.load( './textures/noises/perlin/rgb-256x256.png' );
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+ perlinTexture.wrapS = THREE.RepeatWrapping;
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+ perlinTexture.wrapT = THREE.RepeatWrapping;
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+
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+ // TSL functions
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+
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+ const toRadialUv = tslFn( ( [ uv, multiplier, rotation, offset ] ) => {
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+
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+ const centeredUv = uv.sub( 0.5 ).toVar();
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+ const distanceToCenter = centeredUv.length();
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+ const angle = atan2( centeredUv.y, centeredUv.x );
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+ const radialUv = vec2( angle.add( PI ).div( PI2 ), distanceToCenter ).toVar();
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+ radialUv.mulAssign( multiplier );
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+ radialUv.x.addAssign( rotation );
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+ radialUv.y.addAssign( offset );
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+
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+ return radialUv;
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+
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+ } );
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+
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+ const toSkewedUv = tslFn( ( [ uv, skew ] ) => {
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+
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+ return vec2(
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+ uv.x.add( uv.y.mul( skew.x ) ),
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+ uv.y.add( uv.x.mul( skew.y ) )
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+ );
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+
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+ } );
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+
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+ const twistedCylinder = tslFn( ( [ position, parabolStrength, parabolOffset, parabolAmplitude, time ] ) => {
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+
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+ const angle = atan2( position.z, position.x ).toVar();
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+ const elevation = position.y;
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+
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+ // parabol
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+ const radius = parabolStrength.mul( position.y.sub( parabolOffset ) ).pow( 2 ).add( parabolAmplitude ).toVar();
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+
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+ // turbulences
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+ radius.addAssign( sin( elevation.sub( time ).mul( 20 ).add( angle.mul( 2 ) ) ).mul( 0.05 ) );
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+
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+ const twistedPosition = vec3(
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+ cos( angle ).mul( radius ),
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+ elevation,
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+ sin( angle ).mul( radius )
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+ );
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+
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+ return twistedPosition;
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+
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+ } );
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+
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+ // uniforms
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+
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+ const emissiveColor = uniform( color( '#ff8b4d' ) );
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+ const timeScale = uniform( 0.2 );
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+ const parabolStrength = uniform( 1 );
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+ const parabolOffset = uniform( 0.3 );
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+ const parabolAmplitude = uniform( 0.2 );
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+
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+ // tornado floor
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+
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+ const floorMaterial = new THREE.MeshBasicNodeMaterial( { transparent: true, wireframe: false } );
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+
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+ floorMaterial.outputNode = tslFn( () => {
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+
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+ const time = timerLocal().mul( timeScale );
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+
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+ // noise 1
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+ const noise1Uv = toRadialUv(
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+ uv(),
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+ vec2( 0.5, 0.5 ),
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+ time,
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+ time
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+ );
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+ noise1Uv.assign( toSkewedUv(
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+ noise1Uv,
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+ vec2( - 1, 0 )
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+ ) );
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+ noise1Uv.mulAssign( vec2( 4, 1 ) );
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+ const noise1 = texture( perlinTexture, noise1Uv, 1 ).r.remap( 0.45, 0.7 );
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+
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+ // noise 2
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+ const noise2Uv = toRadialUv(
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+ uv(),
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+ vec2( 2, 8 ),
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+ time.mul( 2 ),
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+ time.mul( 8 )
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+ );
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+ noise2Uv.assign( toSkewedUv(
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+ noise2Uv,
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+ vec2( - 0.25, 0 )
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+ ) );
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+ noise2Uv.mulAssign( vec2( 2, 0.25 ) );
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+ const noise2 = texture( perlinTexture, noise2Uv, 1 ).b.remap( 0.45, 0.7 );
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+
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+ // outer fade
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+ const distanceToCenter = uv().sub( 0.5 ).toVar();
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+ const outerFade = min(
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+ distanceToCenter.length().smoothstep( 0.5, 0.1 ),
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+ distanceToCenter.length().smoothstep( 0, 0.2 )
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+ );
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+
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+ // effect
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+ const effect = noise1.mul( noise2 ).mul( outerFade ).toVar();
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+
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+ // output
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+ return vec4(
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+ emissiveColor.mul( float( 0.2 ).step( effect ) ).mul( 3 ), // Emissive
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+ effect.smoothstep( 0, 0.01 ) // Alpha
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+ );
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+
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+ } )();
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+
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+ const floor = new THREE.Mesh( new THREE.PlaneGeometry( 2, 2 ), floorMaterial );
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+ floor.rotation.x = - Math.PI * 0.5;
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+ scene.add( floor );
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+
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+ // tornado cylinder geometry
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+
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+ const cylinderGeometry = new THREE.CylinderGeometry( 1, 1, 1, 20, 20, true );
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+ cylinderGeometry.translate( 0, 0.5, 0 );
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+
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+ // tornado emissive cylinder
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+
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+ const emissiveMaterial = new THREE.MeshBasicNodeMaterial( { transparent: true, side: THREE.DoubleSide, wireframe: false } );
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+
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+ emissiveMaterial.positionNode = twistedCylinder( positionLocal, parabolStrength, parabolOffset, parabolAmplitude.sub( 0.05 ), timerLocal().mul( timeScale ) );
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+
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+ emissiveMaterial.outputNode = tslFn( () => {
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+
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+ const time = timerLocal().mul( timeScale );
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+
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+ // noise 1
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+ const noise1Uv = uv().add( vec2( time, time.negate() ) ).toVar();
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+ noise1Uv.assign( toSkewedUv(
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+ noise1Uv,
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+ vec2( - 1, 0 )
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+ ) );
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+ noise1Uv.mulAssign( vec2( 2, 0.25 ) );
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+ const noise1 = texture( perlinTexture, noise1Uv, 1 ).r.remap( 0.45, 0.7 );
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+
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+ // noise 2
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+ const noise2Uv = uv().add( vec2( time.mul( 0.5 ), time.negate() ) ).toVar();
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+ noise2Uv.assign( toSkewedUv(
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+ noise2Uv,
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+ vec2( - 1, 0 )
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+ ) );
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+ noise2Uv.mulAssign( vec2( 5, 1 ) );
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+ const noise2 = texture( perlinTexture, noise2Uv, 1 ).g.remap( 0.45, 0.7 );
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+
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+ // outer fade
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+ const outerFade = min(
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+ uv().y.smoothstep( 0, 0.1 ),
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+ uv().y.smoothstep( 1, 0.6 )
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+ );
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+
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+ // effect
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+ const effect = noise1.mul( noise2 ).mul( outerFade );
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+
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+ const emissiveColorLuminance = luminance( emissiveColor );
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+
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+ // output
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+ return vec4(
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+ emissiveColor.mul( 1.2 ).div( emissiveColorLuminance ), // emissive
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+ effect.smoothstep( 0, 0.1 ) // alpha
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+ );
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+
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+ } )();
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+
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+ const emissive = new THREE.Mesh( cylinderGeometry, emissiveMaterial );
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+ emissive.scale.set( 1, 1, 1 );
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+ scene.add( emissive );
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+
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+ // tornado dark cylinder
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+
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+ const darkMaterial = new THREE.MeshBasicNodeMaterial( { transparent: true, side: THREE.DoubleSide, wireframe: false } );
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+
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+ darkMaterial.positionNode = twistedCylinder( positionLocal, parabolStrength, parabolOffset, parabolAmplitude, timerLocal().mul( timeScale ) );
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+
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+ darkMaterial.outputNode = tslFn( () => {
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+
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+ const time = timerLocal().mul( timeScale ).add( 123.4 );
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+
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+ // noise 1
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+ const noise1Uv = uv().add( vec2( time, time.negate() ) ).toVar();
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+ noise1Uv.assign( toSkewedUv(
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+ noise1Uv,
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+ vec2( - 1, 0 )
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+ ) );
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+ noise1Uv.mulAssign( vec2( 2, 0.25 ) );
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+ const noise1 = texture( perlinTexture, noise1Uv, 1 ).g.remap( 0.45, 0.7 );
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+
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+ // noise 2
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+ const noise2Uv = uv().add( vec2( time.mul( 0.5 ), time.negate() ) ).toVar();
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+ noise2Uv.assign( toSkewedUv(
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+ noise2Uv,
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+ vec2( - 1, 0 )
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+ ) );
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+ noise2Uv.mulAssign( vec2( 5, 1 ) );
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+ const noise2 = texture( perlinTexture, noise2Uv, 1 ).b.remap( 0.45, 0.7 );
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+
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+ // outer fade
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+ const outerFade = min(
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+ uv().y.smoothstep( 0, 0.2 ),
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+ uv().y.smoothstep( 1, 0.6 )
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+ );
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+
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+ // effect
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+ const effect = noise1.mul( noise2 ).mul( outerFade );
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+
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+ return vec4(
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+ vec3( 0 ),
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+ effect.smoothstep( 0, 0.01 )
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+ );
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+
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+ } )();
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+
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+ const dark = new THREE.Mesh( cylinderGeometry, darkMaterial );
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+ dark.scale.set( 1, 1, 1 );
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+ scene.add( dark );
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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.setClearColor( 0x201919 );
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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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+ // post processing
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+
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+ postProcessing = new THREE.PostProcessing( renderer );
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+
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+ const scenePass = pass( scene, camera );
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+ const scenePassColor = scenePass.getTextureNode( 'output' );
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+
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+ const bloomPass = bloom( scenePassColor, 1, 0.1, 1 );
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+
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+ postProcessing.outputNode = scenePassColor.add( bloomPass );
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+
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+ // controls
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+
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+ controls = new OrbitControls( camera, renderer.domElement );
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+ controls.target.y = 0.4;
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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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+ // debug
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+
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+ const gui = new GUI();
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+
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+ gui.addColor( { color: emissiveColor.value.getHexString( THREE.SRGBColorSpace ) }, 'color' ).onChange( value => emissiveColor.value.set( value ) ).name( 'emissiveColor' );
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+ gui.add( timeScale, 'value', - 1, 1, 0.01 ).name( 'timeScale' );
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+ gui.add( parabolStrength, 'value', 0, 2, 0.01 ).name( 'parabolStrength' );
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+ gui.add( parabolOffset, 'value', 0, 1, 0.01 ).name( 'parabolOffset' );
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+ gui.add( parabolAmplitude, 'value', 0, 2, 0.01 ).name( 'parabolAmplitude' );
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+
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+ const bloomGui = gui.addFolder( 'bloom' );
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+ bloomGui.add( bloomPass.strength, 'value', 0, 10, 0.01 ).name( 'strength' );
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+ bloomGui.add( bloomPass.radius, 'value', 0, 1, 0.01 ).name( 'radius' );
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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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+ postProcessing.render();
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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
