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211 lines
5.6 KiB
HTML
211 lines
5.6 KiB
HTML
2 months ago
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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 - volumetric cloud</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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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgpu - volumetric cloud
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</div>
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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/webgpu": "../build/three.webgpu.js",
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"three/tsl": "../build/three.tsl.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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<script type="module">
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import * as THREE from 'three';
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import { float, vec3, vec4, If, Break, Fn, smoothstep, texture3D, uniform } from 'three/tsl';
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import { RaymarchingBox } from 'three/addons/tsl/utils/Raymarching.js';
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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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import { ImprovedNoise } from 'three/addons/math/ImprovedNoise.js';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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let renderer, scene, camera;
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let mesh;
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init();
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function init() {
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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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scene = new THREE.Scene();
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camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 100 );
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camera.position.set( 0, 0, 1.5 );
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new OrbitControls( camera, renderer.domElement );
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// Sky
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const canvas = document.createElement( 'canvas' );
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canvas.width = 1;
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canvas.height = 32;
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const context = canvas.getContext( '2d' );
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const gradient = context.createLinearGradient( 0, 0, 0, 32 );
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gradient.addColorStop( 0.0, '#014a84' );
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gradient.addColorStop( 0.5, '#0561a0' );
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gradient.addColorStop( 1.0, '#437ab6' );
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context.fillStyle = gradient;
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context.fillRect( 0, 0, 1, 32 );
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const skyMap = new THREE.CanvasTexture( canvas );
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skyMap.colorSpace = THREE.SRGBColorSpace;
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const sky = new THREE.Mesh(
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new THREE.SphereGeometry( 10 ),
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new THREE.MeshBasicNodeMaterial( { map: skyMap, side: THREE.BackSide } )
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);
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scene.add( sky );
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// Texture
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const size = 128;
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const data = new Uint8Array( size * size * size );
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let i = 0;
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const scale = 0.05;
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const perlin = new ImprovedNoise();
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const vector = new THREE.Vector3();
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for ( let z = 0; z < size; z ++ ) {
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for ( let y = 0; y < size; y ++ ) {
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for ( let x = 0; x < size; x ++ ) {
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const d = 1.0 - vector.set( x, y, z ).subScalar( size / 2 ).divideScalar( size ).length();
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data[ i ] = ( 128 + 128 * perlin.noise( x * scale / 1.5, y * scale, z * scale / 1.5 ) ) * d * d;
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i ++;
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}
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}
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}
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const texture = new THREE.Data3DTexture( data, size, size, size );
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texture.format = THREE.RedFormat;
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texture.minFilter = THREE.LinearFilter;
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texture.magFilter = THREE.LinearFilter;
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texture.unpackAlignment = 1;
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texture.needsUpdate = true;
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// Shader
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const transparentRaymarchingTexture = Fn( ( {
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texture,
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range = float( 0.1 ),
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threshold = float( 0.25 ),
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opacity = float( 0.25 ),
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steps = float( 100 )
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} ) => {
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const finalColor = vec4( 0 ).toVar();
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RaymarchingBox( steps, ( { positionRay } ) => {
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const mapValue = float( texture.sample( positionRay.add( 0.5 ) ).r ).toVar();
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mapValue.assign( smoothstep( threshold.sub( range ), threshold.add( range ), mapValue ).mul( opacity ) );
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const shading = texture.sample( positionRay.add( vec3( - 0.01 ) ) ).r.sub( texture.sample( positionRay.add( vec3( 0.01 ) ) ).r );
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const col = shading.mul( 3.0 ).add( positionRay.x.add( positionRay.y ).mul( 0.25 ) ).add( 0.2 );
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finalColor.rgb.addAssign( finalColor.a.oneMinus().mul( mapValue ).mul( col ) );
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finalColor.a.addAssign( finalColor.a.oneMinus().mul( mapValue ) );
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If( finalColor.a.greaterThanEqual( 0.95 ), () => {
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Break();
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} );
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} );
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return finalColor;
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} );
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// Material
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const baseColor = uniform( new THREE.Color( 0x798aa0 ) );
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const range = uniform( 0.1 );
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const threshold = uniform( 0.25 );
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const opacity = uniform( 0.25 );
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const steps = uniform( 100 );
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const cloud3d = transparentRaymarchingTexture( {
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texture: texture3D( texture, null, 0 ),
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range,
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threshold,
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opacity,
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steps
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} );
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const finalCloud = cloud3d.setRGB( cloud3d.rgb.add( baseColor ) );
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const material = new THREE.NodeMaterial();
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material.colorNode = finalCloud;
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material.side = THREE.BackSide;
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material.transparent = true;
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mesh = new THREE.Mesh( new THREE.BoxGeometry( 1, 1, 1 ), material );
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scene.add( mesh );
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//
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const gui = new GUI();
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gui.add( threshold, 'value', 0, 1, 0.01 ).name( 'threshold' );
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gui.add( opacity, 'value', 0, 1, 0.01 ).name( 'opacity' );
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gui.add( range, 'value', 0, 1, 0.01 ).name( 'range' );
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gui.add( steps, 'value', 0, 200, 1 ).name( 'steps' );
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window.addEventListener( 'resize', onWindowResize );
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function animate() {
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mesh.rotation.y = - performance.now() / 7500;
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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