samien
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three.js
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgpu - volumetric lighting using TRAA</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">
			<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>Volumetric Lighting using TRAA</span>
			</div>

			<small>Compatible with native lights and shadows using TRAA.</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 { vec2, vec3, Fn, texture3D, screenUV, uniform, screenCoordinate, pass, depthPass, mrt, output, velocity, fract, interleavedGradientNoise } from 'three/tsl';

			import { traa } from 'three/addons/tsl/display/TRAANode.js';

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

			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import { ImprovedNoise } from 'three/addons/math/ImprovedNoise.js';
			import { TeapotGeometry } from 'three/addons/geometries/TeapotGeometry.js';

			// Halton sequence for temporal offset - matches TRAA's 32-sample Halton jitter
			// This creates optimal low-discrepancy distribution that accumulates well with TRAA
			function halton( index, base ) {

				let result = 0;
				let f = 1;

				while ( index > 0 ) {

					f /= base;
					result += f * ( index % base );
					index = Math.floor( index / base );

				}

				return result;

			}

			// Generate 32 Halton offsets (base 2, 3) - same length as TRAA
			const _haltonOffsets = Array.from(
				{ length: 32 },
				( _, i ) => [ halton( i + 1, 2 ), halton( i + 1, 3 ) ]
			);

			let renderer, scene, camera;
			let volumetricMesh, teapot, pointLight, spotLight;
			let renderPipeline;
			let temporalOffset, temporalRotation, shaderTime;
			let params;

			init();

			function createTexture3D() {

				let i = 0;

				const size = 128;
				const data = new Uint8Array( size * size * size );

				const scale = 10;
				const perlin = new ImprovedNoise();

				const repeatFactor = 5.0;

				for ( let z = 0; z < size; z ++ ) {

					for ( let y = 0; y < size; y ++ ) {

						for ( let x = 0; x < size; x ++ ) {

							const nx = ( x / size ) * repeatFactor;
							const ny = ( y / size ) * repeatFactor;
							const nz = ( z / size ) * repeatFactor;

							const noiseValue = perlin.noise( nx * scale, ny * scale, nz * scale );

							data[ i ] = ( 128 + 128 * noiseValue );

							i ++;

						}

					}

				}

				const texture = new THREE.Data3DTexture( data, size, size, size );
				texture.format = THREE.RedFormat;
				texture.minFilter = THREE.LinearFilter;
				texture.magFilter = THREE.LinearFilter;
				texture.wrapS = THREE.RepeatWrapping;
				texture.wrapT = THREE.RepeatWrapping;
				texture.unpackAlignment = 1;
				texture.needsUpdate = true;

				return texture;

			}

			function init() {

				renderer = new THREE.WebGPURenderer();
				// renderer.setPixelRatio( window.devicePixelRatio ); // Disable DPR for performance
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				renderer.toneMapping = THREE.NeutralToneMapping;
				renderer.toneMappingExposure = 2;
				renderer.shadowMap.enabled = true;
				renderer.inspector = new Inspector();
				document.body.appendChild( renderer.domElement );

				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 100 );
				camera.position.set( - 8, 1, - 6 );

				const controls = new OrbitControls( camera, renderer.domElement );
				controls.maxDistance = 40;
				controls.minDistance = 2;

				// Volumetric Fog Area

				const noiseTexture3D = createTexture3D();

				const smokeAmount = uniform( 2 );

				const volumetricMaterial = new THREE.VolumeNodeMaterial();
				volumetricMaterial.steps = 12;
				volumetricMaterial.transparent = true;
				volumetricMaterial.blending = THREE.AdditiveBlending;

				// Temporal dithering using Interleaved Gradient Noise (IGN) + Halton sequence
				temporalOffset = uniform( 0 );
				temporalRotation = uniform( 0 );
				shaderTime = uniform( 0 );

				const temporalJitter2D = vec2( temporalOffset, temporalRotation );
				volumetricMaterial.offsetNode = fract( interleavedGradientNoise( screenCoordinate.add( temporalJitter2D.mul( 100 ) ) ).add( temporalOffset ) );
				volumetricMaterial.scatteringNode = Fn( ( { positionRay } ) => {

					const timeScaled = vec3( shaderTime, 0, shaderTime.mul( .3 ) );

					const sampleGrain = ( scale, timeScale = 1 ) => texture3D( noiseTexture3D, positionRay.add( timeScaled.mul( timeScale ) ).mul( scale ).mod( 1 ), 0 ).r.add( .5 );

					let density = sampleGrain( .1 );
					density = density.mul( sampleGrain( .05, 1 ) );
					density = density.mul( sampleGrain( .02, 2 ) );

					return smokeAmount.mix( 1, density );

				} );

				volumetricMesh = new THREE.Mesh( new THREE.BoxGeometry( 20, 10, 20 ), volumetricMaterial );
				volumetricMesh.receiveShadow = true;
				volumetricMesh.position.y = 2;
				scene.add( volumetricMesh );

				// Objects

				teapot = new THREE.Mesh( new TeapotGeometry( .8, 18 ), new THREE.MeshStandardMaterial( { color: 0xffffff, side: THREE.DoubleSide } ) );
				teapot.castShadow = true;
				scene.add( teapot );

				const floor = new THREE.Mesh( new THREE.PlaneGeometry( 100, 100 ), new THREE.MeshStandardMaterial( { color: 0xffffff } ) );
				floor.rotation.x = - Math.PI / 2;
				floor.position.y = - 3;
				floor.receiveShadow = true;
				scene.add( floor );

				// Lights

				pointLight = new THREE.PointLight( 0xf9bb50, 3, 100 );
				pointLight.castShadow = true;
				pointLight.position.set( 0, 1.4, 0 );
				scene.add( pointLight );

				spotLight = new THREE.SpotLight( 0xffffff, 100 );
				spotLight.position.set( 2.5, 5, 2.5 );
				spotLight.angle = Math.PI / 6;
				spotLight.penumbra = 1;
				spotLight.decay = 2;
				spotLight.distance = 0;
				spotLight.map = new THREE.TextureLoader().setPath( 'textures/' ).load( 'colors.png' );
				spotLight.castShadow = true;
				spotLight.shadow.intensity = .98;
				spotLight.shadow.mapSize.width = 1024;
				spotLight.shadow.mapSize.height = 1024;
				spotLight.shadow.camera.near = 1;
				spotLight.shadow.camera.far = 15;
				spotLight.shadow.focus = 1;
				scene.add( spotLight );

				// Render Pipeline

				renderPipeline = new THREE.RenderPipeline( renderer );

				const volumetricIntensity = uniform( 1 );

				// Pre-Pass: Opaque objects only (volumetric is transparent, excluded automatically)

				const prePass = depthPass( scene, camera );
				prePass.name = 'Pre Pass';
				prePass.transparent = false;

				const prePassDepth = prePass.getTextureNode( 'depth' ).toInspector( 'Depth', () => prePass.getLinearDepthNode() );

				// Apply depth to volumetric material for proper occlusion

				volumetricMaterial.depthNode = prePassDepth.sample( screenUV );

				// Scene Pass: Full scene including volumetric with MRT

				const scenePass = pass( scene, camera ).toInspector( 'Scene' );
				scenePass.name = 'Scene Pass';
				scenePass.setMRT( mrt( {
					output: output,
					velocity: velocity
				} ) );

				const scenePassColor = scenePass.getTextureNode().toInspector( 'Output' );
				const scenePassVelocity = scenePass.getTextureNode( 'velocity' ).toInspector( 'Velocity' );

				// TRAA with scene pass depth/velocity (includes volumetric)

				const traaPass = traa( scenePassColor, prePassDepth, scenePassVelocity, camera );

				renderPipeline.outputNode = traaPass;

				// GUI

				params = {
					traa: true,
					animated: true
				};

				const gui = renderer.inspector.createParameters( 'Volumetric Lighting' );

				gui.add( params, 'animated' );
				gui.add( params, 'traa' ).name( 'TRAA' ).onChange( updatePostProcessing );

				const rayMarching = gui.addFolder( 'Ray Marching' );
				rayMarching.add( volumetricMaterial, 'steps', 2, 16, 1 ).name( 'step count' );

				function updatePostProcessing() {

					renderPipeline.outputNode = params.traa ? traaPass : scenePassColor;
					renderPipeline.needsUpdate = true;

				}

				const lighting = gui.addFolder( 'Lighting / Scene' );
				lighting.add( pointLight, 'intensity', 0, 6 ).name( 'light intensity' );
				lighting.add( spotLight, 'intensity', 0, 200 ).name( 'spot intensity' );
				lighting.add( volumetricIntensity, 'value', 0, 2 ).name( 'volumetric intensity' );
				lighting.add( smokeAmount, 'value', 0, 3 ).name( 'smoke amount' );

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

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

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

			}

			let frameCount = 0;
			let animationTime = 0;
			let lastTime = performance.now();

			function animate() {

				const currentTime = performance.now();
				const delta = ( currentTime - lastTime ) * 0.001;
				lastTime = currentTime;

				// Update temporal uniforms - synced with TRAA's Halton sequence for optimal accumulation
				const haltonIndex = frameCount % 32;
				temporalOffset.value = _haltonOffsets[ haltonIndex ][ 0 ];
				temporalRotation.value = _haltonOffsets[ haltonIndex ][ 1 ];
				frameCount ++;

				if ( params.animated ) {

					animationTime += delta;

				}

				shaderTime.value = animationTime;

				const scale = 2.4;

				pointLight.position.x = Math.sin( animationTime * 0.7 ) * scale;
				pointLight.position.y = Math.cos( animationTime * 0.5 ) * scale;
				pointLight.position.z = Math.cos( animationTime * 0.3 ) * scale;

				spotLight.position.x = Math.cos( animationTime * 0.3 ) * scale;
				spotLight.lookAt( 0, 0, 0 );

				teapot.rotation.y = animationTime * 0.2;

				renderPipeline.render();

			}

		</script>

	</body>
</html>