samien
/
three.js
зеркало из https://github.com/mrdoob/three.js.git


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251
							<!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">
		<meta property="og:title" content="three.js webgpu - fog - scattering">
		<meta property="og:type" content="website">
		<meta property="og:url" content="https://threejs.org/examples/webgpu_custom_fog_scattering.html">
		<meta property="og:image" content="https://threejs.org/examples/screenshots/webgpu_custom_fog_scattering.jpg">
		<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 { densityFogFactor, mix, pass, reference, uniform, vec2 } from 'three/tsl';
			import { gaussianBlur } from 'three/addons/tsl/display/GaussianBlurNode.js';

			import { FirstPersonControls } from 'three/addons/controls/FirstPersonControls.js';
			import { Inspector } from 'three/addons/inspector/Inspector.js';
			import { TreeGenerator } from 'three/addons/generators/TreeGenerator.js';

			let camera, scene, renderer, renderPipeline, controls;

			const timer = new THREE.Timer();

			const params = {
				scatteringEnabled: true
			};

			init();

			async function init() {

				camera = new THREE.PerspectiveCamera( 55, window.innerWidth / window.innerHeight, 0.1, 120 );
				camera.position.set( 0.4, 1.7, 9 ); // ~human eye height

				scene = new THREE.Scene();

				// fog: a bright, cool haze. the background matches it so the trunks read
				// as dark silhouettes that dissolve into depth — the scattering subject

				scene.fog = new THREE.FogExp2( 0xc6cace, 0.11 );
				scene.background = new THREE.Color( 0xc6cace );

				// everything is a flat black silhouette — the fog and the scattering blur
				// do all the shaping, so no lights are needed ( MeshBasicMaterial is unlit )

				const material = new THREE.MeshBasicMaterial( { color: 0x000000 } );

				// a few seeded variants of a tall scots pine: a clean bole rising into a
				// high, open crown of fine bare branches

				const variants = [];

				const generator = new TreeGenerator( material );

				for ( let v = 0; v < 6; v ++ ) {

					const mesh = generator
						.setSeed( v + 1 )
						.setTrunkLength( 2.6 + v * 0.3 ) // the crowns ride high in the fog
						.setTrunkRadius( 0.06 )
						.setTaper( 0.28 ) // slender, tapers slowly
						.setLevels( 4 )
						.setChildren( [ 7, 5, 4 ] ) // a wide whorl of limbs ramifying into many fine twigs
						.setBranchAngle( [ 55, 50, 46 ] ) // a rounded crown that turns up
						.setAngleVariance( 22 )
						.setLengthRatio( 0.46 ) // short crown limbs ( a modest pine crown )
						.setMinLength( 0.04 )
						.setDroop( 0.05 )
						.setUpPull( 0.42 ) // crown branches reach up toward the light
						.setGnarl( [ 0, 0.14, 0.24, 0.34 ] ) // dead-straight trunk, wispier twigs
						.setSectionLength( 0.34 )
						.setRadialSegments( 7 )
						.setRadiusExponent( 2.5 ) // slender bole, whippy thin twigs
						.setMinRadius( 0.0023 ) // very fine twigs
						.setTrunkClear( 0.72 ) // tall clean bole; the crown sits only at the top
						.build();

					variants.push( mesh.geometry );

				}

				const placements = variants.map( () => [] );

				const dummy = new THREE.Object3D();
				const cols = 13, rows = 12, spacing = 1.9;

				for ( let i = 0; i < cols; i ++ ) {

					for ( let j = 0; j < rows; j ++ ) {

						const v = Math.floor( Math.random() * variants.length );

						const x = ( i - cols / 2 ) * spacing + ( Math.random() - 0.5 ) * spacing * 0.8;
						const z = j * spacing - rows * spacing + 4.2 + ( Math.random() - 0.5 ) * spacing * 0.8;

						dummy.position.set( x, 0, z );

						const scale = 0.85 + Math.random() * 0.4;
						dummy.rotation.set( ( Math.random() - 0.5 ) * 0.05, Math.random() * Math.PI * 2, ( Math.random() - 0.5 ) * 0.05 ); // slight lean
						dummy.scale.set( scale, scale * ( 0.9 + Math.random() * 0.3 ), scale );
						dummy.updateMatrix();

						placements[ v ].push( dummy.matrix.clone() );

					}

				}

				variants.forEach( ( geometry, v ) => {

					const list = placements[ v ];
					const mesh = new THREE.InstancedMesh( geometry, material, list.length );
					for ( let k = 0; k < list.length; k ++ ) mesh.setMatrixAt( k, list[ k ] );
					mesh.instanceMatrix.needsUpdate = true;
					scene.add( mesh );

				} );

				// a couple of dominant trunks close to the camera to anchor the depth

				[ [ - 1.1, 4.9, 1.5, 1.1 ], [ 1.5, 4, 1.2, 0.3 ] ].forEach( ( [ x, z, s, ry ] ) => {

					const hero = new THREE.Mesh( variants[ variants.length - 1 ], material );
					hero.position.set( x, 0, z );
					hero.rotation.y = ry;
					hero.scale.setScalar( s );
					scene.add( hero );

				} );

				// ground

				const ground = new THREE.Mesh( new THREE.PlaneGeometry( 600, 600 ).rotateX( - Math.PI / 2 ), material );
				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 FirstPersonControls( camera, renderer.domElement );
				controls.movementSpeed = 2;
				controls.lookSpeed = 0.1;
				controls.lookAt( - 0.2, 1.7, - 8 );

				renderPipeline = new THREE.RenderPipeline( renderer );

				// uniforms

				const density = reference( 'density', 'float', scene.fog );
				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 );
			
				renderPipeline.outputNode = compositeNode;

				// gui

				const gui = renderer.inspector.createParameters( 'Settings' );
				gui.add( scene.fog, 'density', 0.025, 0.16 ).step( 0.0005 ).name( 'fog density' );
				gui.add( scattering, 'value', 0, 5 ).name( 'scattering factor' );
				gui.add( params, 'scatteringEnabled' ).name( 'enable scattering' ).onChange( ( value ) => {
			
					if ( value === true ) {

						renderPipeline.outputNode = compositeNode;

					} else {

						renderPipeline.outputNode = scenePassColor;

					}

					renderPipeline.needsUpdate = true;

				} );

				window.addEventListener( 'resize', resize );

			}

			function resize() {

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

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

			}

			function animate() {

				timer.update();
				controls.update( timer.getDelta() );

				renderPipeline.render();

			}

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