examples/webgpu_backdrop_water.html

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	<head>
		<title>three.js - WebGPU - Backdrop Water</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">
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	<body>

		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> WebGPU - Backdrop Water
		</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';
			import { color, vec2, pass, linearDepth, normalWorld, triplanarTexture, texture, objectPosition, screenUV, viewportLinearDepth, viewportDepthTexture, viewportSharedTexture, mx_worley_noise_float, positionWorld, time } from 'three/tsl';
			import { gaussianBlur } from 'three/addons/tsl/display/GaussianBlurNode.js';

			import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';

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

			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

			import Stats from 'three/addons/libs/stats.module.js';

			let camera, scene, renderer;
			let mixer, objects, clock;
			let model, floor, floorPosition;
			let postProcessing;
			let controls;
			let stats;

			init();

			function init() {

				camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.25, 30 );
				camera.position.set( 3, 2, 4 );

				scene = new THREE.Scene();
				scene.fog = new THREE.Fog( 0x0487e2, 7, 25 );
				scene.backgroundNode = normalWorld.y.mix( color( 0x0487e2 ), color( 0x0066ff ) );
				camera.lookAt( 0, 1, 0 );

				const sunLight = new THREE.DirectionalLight( 0xFFE499, 5 );
				sunLight.castShadow = true;
				sunLight.shadow.camera.near = .1;
				sunLight.shadow.camera.far = 5;
				sunLight.shadow.camera.right = 2;
				sunLight.shadow.camera.left = - 2;
				sunLight.shadow.camera.top = 1;
				sunLight.shadow.camera.bottom = - 2;
				sunLight.shadow.mapSize.width = 2048;
				sunLight.shadow.mapSize.height = 2048;
				sunLight.shadow.bias = - 0.001;
				sunLight.position.set( .5, 3, .5 );

				const waterAmbientLight = new THREE.HemisphereLight( 0x333366, 0x74ccf4, 5 );
				const skyAmbientLight = new THREE.HemisphereLight( 0x74ccf4, 0, 1 );

				scene.add( sunLight );
				scene.add( skyAmbientLight );
				scene.add( waterAmbientLight );

				clock = new THREE.Clock();

				// animated model

				const loader = new GLTFLoader();
				loader.load( 'models/gltf/Michelle.glb', function ( gltf ) {

					model = gltf.scene;
					model.children[ 0 ].children[ 0 ].castShadow = true;

					mixer = new THREE.AnimationMixer( model );

					const action = mixer.clipAction( gltf.animations[ 0 ] );
					action.play();

					scene.add( model );

				} );

				// objects

				const textureLoader = new THREE.TextureLoader();
				const iceDiffuse = textureLoader.load( './textures/water.jpg' );
				iceDiffuse.wrapS = THREE.RepeatWrapping;
				iceDiffuse.wrapT = THREE.RepeatWrapping;
				iceDiffuse.colorSpace = THREE.NoColorSpace;

				const iceColorNode = triplanarTexture( texture( iceDiffuse ) ).add( color( 0x0066ff ) ).mul( .8 );

				const geometry = new THREE.IcosahedronGeometry( 1, 3 );
				const material = new THREE.MeshStandardNodeMaterial( { colorNode: iceColorNode } );

				const count = 100;
				const scale = 3.5;
				const column = 10;

				objects = new THREE.Group();

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

					const x = i % column;
					const y = i / column;

					const mesh = new THREE.Mesh( geometry, material );
					mesh.position.set( x * scale, 0, y * scale );
					mesh.rotation.set( Math.random(), Math.random(), Math.random() );
					objects.add( mesh );

				}

				objects.position.set(
					( ( column - 1 ) * scale ) * - .5,
					- 1,
					( ( count / column ) * scale ) * - .5
				);

				scene.add( objects );

				// water

				const timer = time.mul( .8 );
				const floorUV = positionWorld.xzy;

				const waterLayer0 = mx_worley_noise_float( floorUV.mul( 4 ).add( timer ) );
				const waterLayer1 = mx_worley_noise_float( floorUV.mul( 2 ).add( timer ) );

				const waterIntensity = waterLayer0.mul( waterLayer1 );
				const waterColor = waterIntensity.mul( 1.4 ).mix( color( 0x0487e2 ), color( 0x74ccf4 ) );

				// linearDepth() returns the linear depth of the mesh
				const depth = linearDepth();
				const depthWater = viewportLinearDepth.sub( depth );
				const depthEffect = depthWater.remapClamp( - .002, .04 );

				const refractionUV = screenUV.add( vec2( 0, waterIntensity.mul( .1 ) ) );

				// linearDepth( viewportDepthTexture( uv ) ) return the linear depth of the scene
				const depthTestForRefraction = linearDepth( viewportDepthTexture( refractionUV ) ).sub( depth );

				const depthRefraction = depthTestForRefraction.remapClamp( 0, .1 );

				const finalUV = depthTestForRefraction.lessThan( 0 ).select( screenUV, refractionUV );

				const viewportTexture = viewportSharedTexture( finalUV );

				const waterMaterial = new THREE.MeshBasicNodeMaterial();
				waterMaterial.colorNode = waterColor;
				waterMaterial.backdropNode = depthEffect.mix( viewportSharedTexture(), viewportTexture.mul( depthRefraction.mix( 1, waterColor ) ) );
				waterMaterial.backdropAlphaNode = depthRefraction.oneMinus();
				waterMaterial.transparent = true;

				const water = new THREE.Mesh( new THREE.BoxGeometry( 50, .001, 50 ), waterMaterial );
				water.position.set( 0, 0, 0 );
				scene.add( water );

				// floor

				floor = new THREE.Mesh( new THREE.CylinderGeometry( 1.1, 1.1, 10 ), new THREE.MeshStandardNodeMaterial( { colorNode: iceColorNode } ) );
				floor.position.set( 0, - 5, 0 );
				scene.add( floor );

				// caustics

				const waterPosY = positionWorld.y.sub( water.position.y );

				let transition = waterPosY.add( .1 ).saturate().oneMinus();
				transition = waterPosY.lessThan( 0 ).select( transition, normalWorld.y.mix( transition, 0 ) ).toVar();

				const colorNode = transition.mix( material.colorNode, material.colorNode.add( waterLayer0 ) );

				//material.colorNode = colorNode;
				floor.material.colorNode = colorNode;

				// renderer

				renderer = new THREE.WebGPURenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				document.body.appendChild( renderer.domElement );

				stats = new Stats();
				document.body.appendChild( stats.dom );

				controls = new OrbitControls( camera, renderer.domElement );
				controls.minDistance = 1;
				controls.maxDistance = 10;
				controls.maxPolarAngle = Math.PI * 0.9;
				controls.autoRotate = true;
				controls.autoRotateSpeed = 1;
				controls.target.set( 0, .2, 0 );
				controls.update();

				// gui

				const gui = new GUI();

				floorPosition = new THREE.Vector3( 0, .2, 0 );

				gui.add( floorPosition, 'y', - 1, 1, .001 ).name( 'position' );

				// post processing

				const scenePass = pass( scene, camera );
				const scenePassColor = scenePass.getTextureNode();
				const scenePassDepth = scenePass.getLinearDepthNode().remapClamp( .3, .5 );

				const waterMask = objectPosition( camera ).y.greaterThan( screenUV.y.sub( .5 ).mul( camera.near ) );

				const scenePassColorBlurred = gaussianBlur( scenePassColor );
				scenePassColorBlurred.directionNode = waterMask.select( scenePassDepth, scenePass.getLinearDepthNode().mul( 5 ) );

				const vignette = screenUV.distance( .5 ).mul( 1.35 ).clamp().oneMinus();

				postProcessing = new THREE.PostProcessing( renderer );
				postProcessing.outputNode = waterMask.select( scenePassColorBlurred, scenePassColorBlurred.mul( color( 0x74ccf4 ) ).mul( vignette ) );

				//

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

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

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

			}

			function animate() {

				stats.update();

				controls.update();

				const delta = clock.getDelta();

				floor.position.y = floorPosition.y - 5;

				if ( model ) {

					mixer.update( delta );

					model.position.y = floorPosition.y;

				}

				for ( const object of objects.children ) {

					object.position.y = Math.sin( clock.elapsedTime + object.id ) * .3;
					object.rotation.y += delta * .3;

				}

				postProcessing.render();

			}

		</script>
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