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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgpu - volumetric cloud</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</a> webgpu - volumetric cloud
- </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 { vec3, materialReference, smoothstep, If, Break, Fn } from 'three/tsl';
- import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- import { ImprovedNoise } from 'three/addons/math/ImprovedNoise.js';
- import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
- let renderer, scene, camera;
- let mesh;
- init();
- function init() {
- renderer = new THREE.WebGPURenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.setAnimationLoop( animate );
- document.body.appendChild( renderer.domElement );
- scene = new THREE.Scene();
- camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 100 );
- camera.position.set( 0, 0, 1.5 );
- new OrbitControls( camera, renderer.domElement );
- // Sky
- const canvas = document.createElement( 'canvas' );
- canvas.width = 1;
- canvas.height = 32;
- const context = canvas.getContext( '2d' );
- const gradient = context.createLinearGradient( 0, 0, 0, 32 );
- gradient.addColorStop( 0.0, '#014a84' );
- gradient.addColorStop( 0.5, '#0561a0' );
- gradient.addColorStop( 1.0, '#437ab6' );
- context.fillStyle = gradient;
- context.fillRect( 0, 0, 1, 32 );
- const skyMap = new THREE.CanvasTexture( canvas );
- skyMap.colorSpace = THREE.SRGBColorSpace;
- const sky = new THREE.Mesh(
- new THREE.SphereGeometry( 10 ),
- new THREE.MeshBasicNodeMaterial( { map: skyMap, side: THREE.BackSide } )
- );
- scene.add( sky );
- // Texture
- const size = 128;
- const data = new Uint8Array( size * size * size );
- let i = 0;
- const scale = 0.05;
- const perlin = new ImprovedNoise();
- const vector = new THREE.Vector3();
- for ( let z = 0; z < size; z ++ ) {
- for ( let y = 0; y < size; y ++ ) {
- for ( let x = 0; x < size; x ++ ) {
- const d = 1.0 - vector.set( x, y, z ).subScalar( size / 2 ).divideScalar( size ).length();
- data[ i ] = ( 128 + 128 * perlin.noise( x * scale / 1.5, y * scale, z * scale / 1.5 ) ) * d * d;
- i ++;
- }
- }
- }
- const texture = new THREE.Data3DTexture( data, size, size, size );
- texture.format = THREE.RedFormat;
- texture.minFilter = THREE.LinearFilter;
- texture.magFilter = THREE.LinearFilter;
- texture.unpackAlignment = 1;
- texture.needsUpdate = true;
- const geometry = new THREE.BoxGeometry( 1, 1, 1 );
- const material = new THREE.VolumeNodeMaterial( {
- side: THREE.BackSide,
- transparent: true
- } );
- material.map = texture;
- material.base = new THREE.Color( 0x798aa0 );
- material.steps = 100;
- material.range = 0.1;
- material.threshold = 0.25;
- material.opacity = 0.25;
- const range = materialReference( 'range', 'float' );
- const threshold = materialReference( 'threshold', 'float' );
- const opacity = materialReference( 'opacity', 'float' );
- material.testNode = Fn( ( { map, mapValue, probe, finalColor } ) => {
- mapValue.assign( smoothstep( threshold.sub( range ), threshold.add( range ), mapValue ).mul( opacity ) );
- const shading = map.uv( probe.add( vec3( - 0.01 ) ) ).r.sub( map.uv( probe.add( vec3( 0.01 ) ) ).r );
- const col = shading.mul( 3.0 ).add( probe.x.add( probe.y ).mul( 0.25 ) ).add( 0.2 );
- finalColor.rgb.addAssign( finalColor.a.oneMinus().mul( mapValue ).mul( col ) );
- finalColor.a.addAssign( finalColor.a.oneMinus().mul( mapValue ) );
- If( finalColor.a.greaterThanEqual( 0.95 ), () => {
- Break();
- } );
- } );
- mesh = new THREE.Mesh( geometry, material );
- scene.add( mesh );
- //
- const parameters = {
- threshold: 0.25,
- opacity: 0.25,
- range: 0.1,
- steps: 100
- };
- function update() {
- material.threshold = parameters.threshold;
- material.opacity = parameters.opacity;
- material.range = parameters.range;
- material.steps = parameters.steps;
- }
- const gui = new GUI();
- gui.add( parameters, 'threshold', 0, 1, 0.01 ).onChange( update );
- gui.add( parameters, 'opacity', 0, 1, 0.01 ).onChange( update );
- gui.add( parameters, 'range', 0, 1, 0.01 ).onChange( update );
- gui.add( parameters, 'steps', 0, 200, 1 ).onChange( update );
- window.addEventListener( 'resize', onWindowResize );
- }
- function onWindowResize() {
- camera.aspect = window.innerWidth / window.innerHeight;
- camera.updateProjectionMatrix();
- renderer.setSize( window.innerWidth, window.innerHeight );
- }
- function animate() {
- mesh.rotation.y = - performance.now() / 7500;
- renderer.render( scene, camera );
- }
- </script>
- </body>
- </html>
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