samien
/
three.js
mirror of https://github.com/mrdoob/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgpu - fog - scattering</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="example.css">
	</head>
	<body>

		<div id="info" class="invert">
			<a href="https://threejs.org/" target="_blank" rel="noopener" class="logo-link"></a>

			<div class="title-wrapper">
				<a href="https://threejs.org/" target="_blank" rel="noopener">three.js</a><span>Fog - Scattering</span>
			</div>

			<small>
				The demo simulates light scattering due to fog.<br/>
			</small>
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.webgpu.js",
					"three/webgpu": "../build/three.webgpu.js",
					"three/tsl": "../build/three.tsl.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three/webgpu';
			import { positionWorld, densityFogFactor, pass, vec2, uniform, mix, color } from 'three/tsl';
			import { gaussianBlur } from 'three/addons/tsl/display/GaussianBlurNode.js';

			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import { Inspector } from 'three/addons/inspector/Inspector.js';

			let camera, scene, renderer, postProcessing, controls;

			const params = {
				scatteringEnabled: true
			};

			init();

			async function init() {

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 600 );
				camera.position.set( 30, 10, 30 );

				scene = new THREE.Scene();

				// fog

				scene.fog = new THREE.FogExp2( 0xcccccc, 0.014 );
				scene.background = new THREE.Color( 0xcccccc );

				// builds

				const buildWindows = positionWorld.y.mul( 10 ).floor().mod( 4 ).sign().mix( color( 0x000066 ), color( 0xffffff ) );

				const buildGeometry = new THREE.BoxGeometry( 1, 1, 1 );
				const buildMaterial = new THREE.MeshPhongNodeMaterial( {
					colorNode: buildWindows
				} );

				const buildMesh = new THREE.InstancedMesh( buildGeometry, buildMaterial, 4000 );
				scene.add( buildMesh );

				const dummy = new THREE.Object3D();
				const center = new THREE.Vector3();

				for ( let i = 0; i < buildMesh.count; i ++ ) {

					const scaleY = Math.random() * 7 + .5;

					dummy.position.x = Math.random() * 600 - 300;
					dummy.position.z = Math.random() * 600 - 300;

					const distance = Math.max( dummy.position.distanceTo( center ) * .012, 1 );

					dummy.position.y = .5 * scaleY * distance;

					dummy.scale.x = dummy.scale.z = Math.random() * 3 + .5;
					dummy.scale.y = scaleY * distance;

					dummy.updateMatrix();

					buildMesh.setMatrixAt( i, dummy.matrix );

				}

				// lights

				scene.add( new THREE.HemisphereLight( 0xf0f5f5, 0xd0dee7, 0.5 ) );

				// geometry

				const planeGeometry = new THREE.PlaneGeometry( 200, 200 );
				const planeMaterial = new THREE.MeshPhongMaterial( {
					color: 0x999999
				} );

				const ground = new THREE.Mesh( planeGeometry, planeMaterial );
				ground.rotation.x = - Math.PI / 2;
				ground.scale.multiplyScalar( 3 );
				ground.castShadow = true;
				ground.receiveShadow = true;
				scene.add( ground );
			
				// renderer

				renderer = new THREE.WebGPURenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				renderer.inspector = new Inspector();
				document.body.appendChild( renderer.domElement );

				// controls

				controls = new OrbitControls( camera, renderer.domElement );
				controls.target.set( 0, 2, 0 );
				controls.minDistance = 7;
				controls.maxDistance = 100;
				controls.maxPolarAngle = Math.PI / 2;
				controls.enableDamping = true;
				controls.update();

				//

				postProcessing = new THREE.PostProcessing( renderer );

				// uniforms

				const density = uniform( 0.014 );
				const scattering = uniform( 2 );

				// scene pass

				const scenePass = pass( scene, camera );

				const scenePassColor = scenePass.getTextureNode( 'output' );
				const scenePassViewZ = scenePass.getViewZNode();

				// blur pass (always downsampled to improve performance)

				const sceneColorBlurred = gaussianBlur( scenePassColor, vec2( scattering ), 4, { resolutionScale: 0.5 } );

				// composite

				const fogFactor = densityFogFactor( density ).context( { getViewZ: () => scenePassViewZ } );

				const compositeNode = mix( scenePassColor, sceneColorBlurred, fogFactor );
			
				postProcessing.outputNode = compositeNode;

				// gui

				const gui = renderer.inspector.createParameters( 'Settings' );
				gui.add( density, 'value', 0.005, 0.03 ).step( 0.0001 ).name( 'fog density' ).onChange( ( value ) => {
			
					scene.fog.density = value;

				} );
				gui.add( scattering, 'value', 0, 5 ).name( 'scattering factor' );
				gui.add( params, 'scatteringEnabled' ).name( 'enable scattering' ).onChange( ( value ) => {
			
					if ( value === true ) {

						postProcessing.outputNode = compositeNode;

					} else {

						postProcessing.outputNode = scenePassColor;

					}

					postProcessing.needsUpdate = true;

				} );

				window.addEventListener( 'resize', resize );

			}

			function resize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function animate() {

				controls.update();

				postProcessing.render();

			}

		</script>
	</body>
</html>