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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 - fog - scattering</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="example.css">
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+ </head>
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+ <body>
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+
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+ <div id="info" class="invert">
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+ <a href="https://threejs.org/" target="_blank" rel="noopener" class="logo-link"></a>
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+
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+ <div class="title-wrapper">
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+ <a href="https://threejs.org/" target="_blank" rel="noopener">three.js</a><span>Fog - Scattering</span>
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+ </div>
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+
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+ <small>
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+ The demo simulates light scattering due to fog.<br/>
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+ </small>
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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/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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+
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+ <script type="module">
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+
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+ import * as THREE from 'three/webgpu';
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+ import { positionWorld, densityFogFactor, pass, vec2, uniform, mix, color } from 'three/tsl';
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+ import { gaussianBlur } from 'three/addons/tsl/display/GaussianBlurNode.js';
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+
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+ import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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+ import { Inspector } from 'three/addons/inspector/Inspector.js';
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+
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+ let camera, scene, renderer, postProcessing, controls;
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+
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+ const params = {
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+ scatteringEnabled: true
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+ };
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+
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+ init();
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+
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+ async function init() {
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+
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+ camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 600 );
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+ camera.position.set( 30, 10, 30 );
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+
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+ scene = new THREE.Scene();
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+
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+ // fog
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+
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+ scene.fog = new THREE.FogExp2( 0xcccccc, 0.014 );
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+ scene.background = new THREE.Color( 0xcccccc );
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+
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+ // builds
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+
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+ const buildWindows = positionWorld.y.mul( 10 ).floor().mod( 4 ).sign().mix( color( 0x000066 ), color( 0xffffff ) );
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+
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+ const buildGeometry = new THREE.BoxGeometry( 1, 1, 1 );
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+ const buildMaterial = new THREE.MeshPhongNodeMaterial( {
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+ colorNode: buildWindows
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+ } );
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+
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+ const buildMesh = new THREE.InstancedMesh( buildGeometry, buildMaterial, 4000 );
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+ scene.add( buildMesh );
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+
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+ const dummy = new THREE.Object3D();
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+ const center = new THREE.Vector3();
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+
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+ for ( let i = 0; i < buildMesh.count; i ++ ) {
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+
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+ const scaleY = Math.random() * 7 + .5;
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+
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+ dummy.position.x = Math.random() * 600 - 300;
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+ dummy.position.z = Math.random() * 600 - 300;
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+
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+ const distance = Math.max( dummy.position.distanceTo( center ) * .012, 1 );
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+
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+ dummy.position.y = .5 * scaleY * distance;
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+
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+ dummy.scale.x = dummy.scale.z = Math.random() * 3 + .5;
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+ dummy.scale.y = scaleY * distance;
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+
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+ dummy.updateMatrix();
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+
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+ buildMesh.setMatrixAt( i, dummy.matrix );
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+
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+ }
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+
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+ // lights
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+
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+ scene.add( new THREE.HemisphereLight( 0xf0f5f5, 0xd0dee7, 0.5 ) );
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+
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+ // geometry
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+
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+ const planeGeometry = new THREE.PlaneGeometry( 200, 200 );
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+ const planeMaterial = new THREE.MeshPhongMaterial( {
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+ color: 0x999999
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+ } );
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+
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+ const ground = new THREE.Mesh( planeGeometry, planeMaterial );
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+ ground.rotation.x = - Math.PI / 2;
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+ ground.scale.multiplyScalar( 3 );
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+ ground.castShadow = true;
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+ ground.receiveShadow = true;
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+ scene.add( ground );
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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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+ renderer.inspector = new Inspector();
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+ document.body.appendChild( renderer.domElement );
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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.set( 0, 2, 0 );
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+ controls.minDistance = 7;
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+ controls.maxDistance = 100;
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+ controls.maxPolarAngle = Math.PI / 2;
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+ controls.enableDamping = true;
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+ controls.update();
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+
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+ //
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+
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+ postProcessing = new THREE.PostProcessing( renderer );
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+
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+ // uniforms
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+
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+ const density = uniform( 0.014 );
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+ const scattering = uniform( 2 );
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+
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+ // scene pass
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+
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+ const scenePass = pass( scene, camera );
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+
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+ const scenePassColor = scenePass.getTextureNode( 'output' );
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+ const scenePassViewZ = scenePass.getViewZNode();
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+
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+ // blur pass (always downsampled to improve performance)
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+
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+ const sceneColorBlurred = gaussianBlur( scenePassColor, vec2( scattering ), 4, { resolutionScale: 0.5 } );
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+
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+ // composite
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+
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+ const fogFactor = densityFogFactor( density ).context( { getViewZ: () => scenePassViewZ } );
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+
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+ const compositeNode = mix( scenePassColor, sceneColorBlurred, fogFactor );
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+
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+ postProcessing.outputNode = compositeNode;
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+
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+ // gui
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+
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+ const gui = renderer.inspector.createParameters( 'Settings' );
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+ gui.add( density, 'value', 0.005, 0.03 ).step( 0.0001 ).name( 'fog density' ).onChange( ( value ) => {
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+
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+ scene.fog.density = value;
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+
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+ } );
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+ gui.add( scattering, 'value', 0, 5 ).name( 'scattering factor' );
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+ gui.add( params, 'scatteringEnabled' ).name( 'enable scattering' ).onChange( ( value ) => {
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+
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+ if ( value === true ) {
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+
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+ postProcessing.outputNode = compositeNode;
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+
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+ } else {
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+
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+ postProcessing.outputNode = scenePassColor;
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+
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+ }
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+
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+ postProcessing.needsUpdate = true;
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+
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+ } );
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+
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+ window.addEventListener( 'resize', resize );
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+
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+ }
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+
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+ function resize() {
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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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+ 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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Michael Herzog
