javascript
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three.js
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	<head>
		<title>three.js - WebGPU - Occlusion</title>
		<meta charset="utf-8">
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		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - WebGPU - Occlusion<br />
			The plane changes color if the sphere behind it is rendered
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/",
					"three/nodes": "./jsm/nodes/Nodes.js"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';
			import { nodeObject, uniform, Node, NodeUpdateType, MeshPhongNodeMaterial } from 'three/nodes';

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

			import WebGPU from 'three/addons/capabilities/WebGPU.js';
			import WebGPURenderer from 'three/addons/renderers/webgpu/WebGPURenderer.js';

			let camera, scene, renderer, controls;

			class OcclusionNode extends Node {

				constructor( testObject, normalColor, occludedColor ) {

					super( 'vec3' );

					this.updateType = NodeUpdateType.OBJECT;

					this.uniformNode = uniform( new THREE.Color() );

					this.testObject = testObject;
					this.normalColor = normalColor;
					this.occludedColor = occludedColor;

				}

				async update( frame ) {

					const isOccluded = frame.renderer.isOccluded( this.testObject );

					this.uniformNode.value.copy( isOccluded ? this.occludedColor : this.normalColor );

				}

				setup( /* builder */ ) {

					return this.uniformNode;

				}

			}

			init();
			render();

			function init() {

				if ( WebGPU.isAvailable() === false ) {

					document.body.appendChild( WebGPU.getErrorMessage() );

					throw new Error( 'No WebGPU support' );

				}

				camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.01, 100 );
				camera.position.z = 7;

				scene = new THREE.Scene();

				// lights

				const ambientLight = new THREE.AmbientLight( 0xb0b0b0 );

				const light = new THREE.DirectionalLight( 0xFFFFFF, 1.0 );
				light.position.set( 0.32, 0.39, 0.7 );

				scene.add( ambientLight );
				scene.add( light );

				// models

				const planeGeometry = new THREE.PlaneGeometry( 2, 2 );
				const sphereGeometry = new THREE.SphereGeometry( 0.5 );

				const plane = new THREE.Mesh( planeGeometry, new MeshPhongNodeMaterial( { color: 0x00ff00 } ) );
				const sphere = new THREE.Mesh( sphereGeometry, new MeshPhongNodeMaterial( { color: 0xffff00 } ) );

				const instanceUniform = nodeObject( new OcclusionNode( sphere, new THREE.Color( 0x00ff00 ), new THREE.Color( 0x0000ff ) ) );

				plane.material.colorNode = instanceUniform;

				sphere.position.z = - 1;
				sphere.occlusionTest = true;

				scene.add( plane );
				scene.add( sphere );

				// renderer

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

				// controls

				controls = new OrbitControls( camera, renderer.domElement );
				controls.minDistance = 3;
				controls.maxDistance = 25;

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

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

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

			}

			function render() {

				renderer.render( scene, camera );

			}

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