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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgpu - custom fog</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="main.css">
	</head>
	<body>
		<div id="info">
		<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgpu - custom fog
		</div>

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

		<script type="module">

			import * as THREE from 'three';
			import { color, fog, float, positionWorld, triNoise3D, positionView, normalWorld, uniform } from 'three/tsl';

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

			let camera, scene, renderer;
			let controls;

			init();

			function init() {

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 600 );
				camera.position.set( 30, 15, 30 );

				scene = new THREE.Scene();

				// custom fog

				const skyColor = color( 0xf0f5f5 );
				const groundColor = color( 0xd0dee7 );

				const fogNoiseDistance = positionView.z.negate().smoothstep( 0, camera.far - 300 );

				const distance = fogNoiseDistance.mul( 20 ).max( 4 );
				const alpha = .98;
				const groundFogArea = float( distance ).sub( positionWorld.y ).div( distance ).pow( 3 ).saturate().mul( alpha );

				// a alternative way to create a TimerNode
				const timer = uniform( 0 ).onFrameUpdate( ( frame ) => frame.time );

				const fogNoiseA = triNoise3D( positionWorld.mul( .005 ), 0.2, timer );
				const fogNoiseB = triNoise3D( positionWorld.mul( .01 ), 0.2, timer.mul( 1.2 ) );

				const fogNoise = fogNoiseA.add( fogNoiseB ).mul( groundColor );

				// apply custom fog

				scene.fogNode = fog( fogNoiseDistance.oneMinus().mix( groundColor, fogNoise ), groundFogArea );
				scene.backgroundNode = normalWorld.y.max( 0 ).mix( groundColor, skyColor );

				// builds

				const buildWindows = positionWorld.y.mul( 10 ).floor().mod( 4 ).sign().mix( color( 0x000066 ).add( fogNoiseDistance ), 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( skyColor.value, groundColor.value, 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 );
				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.autoRotate = true;
				controls.autoRotateSpeed = .1;
				controls.update();

				window.addEventListener( 'resize', resize );

			}

			function resize() {

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

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

			}

			function animate() {

				controls.update();

				renderer.render( scene, camera );

			}

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