examples/webgl_materials_envmaps_groundprojected.html

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			threejs webgl - materials - ground projected environment mapping
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			<a href="https://threejs.org" target="_blank" rel="noopener">threejs</a> - Ground projected environment mapping.<br>
			Ferrari 458 Italia model by <a href="https://sketchfab.com/models/57bf6cc56931426e87494f554df1dab6" target="_blank" rel="noopener">vicent091036</a><br>
			<a href="https://polyhaven.com/a/blouberg_sunrise_2" target="_blank" rel="noopener">Blouberg Sunrise 2</a> by <a href="https://gregzaal.com/" target="_blank" rel="noopener">Greg Zaal</a>
		</div>

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

		<script type="module">
			import * as THREE from 'three';

			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import { GroundedSkybox } from 'three/addons/objects/GroundedSkybox.js';
			import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
			import { DRACOLoader } from 'three/addons/loaders/DRACOLoader.js';
			import { RGBELoader } from 'three/addons/loaders/RGBELoader.js';

			const params = {
				height: 15,
				radius: 100,
				enabled: true,
			};

			let camera, scene, renderer, skybox;

			init().then( render );

			async function init() {

				camera = new THREE.PerspectiveCamera(
					40,
					window.innerWidth / window.innerHeight,
					1,
					1000
				);
				camera.position.set( - 20, 7, 20 );
				camera.lookAt( 0, 4, 0 );

				scene = new THREE.Scene();

				const hdrLoader = new RGBELoader();
				const envMap = await hdrLoader.loadAsync( 'textures/equirectangular/blouberg_sunrise_2_1k.hdr' );
				envMap.mapping = THREE.EquirectangularReflectionMapping;

				skybox = new GroundedSkybox( envMap, params.height, params.radius );
				skybox.position.y = params.height - 0.01;
				scene.add( skybox );

				scene.environment = envMap;

				const dracoLoader = new DRACOLoader();
				dracoLoader.setDecoderPath( 'jsm/libs/draco/gltf/' );

				const loader = new GLTFLoader();
				loader.setDRACOLoader( dracoLoader );

				const shadow = new THREE.TextureLoader().load( 'models/gltf/ferrari_ao.png' );

				loader.load( 'models/gltf/ferrari.glb', function ( gltf ) {

					const bodyMaterial = new THREE.MeshPhysicalMaterial( {
						color: 0x000000, metalness: 1.0, roughness: 0.8,
						clearcoat: 1.0, clearcoatRoughness: 0.2
					} );

					const detailsMaterial = new THREE.MeshStandardMaterial( {
						color: 0xffffff, metalness: 1.0, roughness: 0.5
					} );

					const glassMaterial = new THREE.MeshPhysicalMaterial( {
						color: 0xffffff, metalness: 0.25, roughness: 0, transmission: 1.0
					} );

					const carModel = gltf.scene.children[ 0 ];
					carModel.scale.multiplyScalar( 4 );
					carModel.rotation.y = Math.PI;

					carModel.getObjectByName( 'body' ).material = bodyMaterial;

					carModel.getObjectByName( 'rim_fl' ).material = detailsMaterial;
					carModel.getObjectByName( 'rim_fr' ).material = detailsMaterial;
					carModel.getObjectByName( 'rim_rr' ).material = detailsMaterial;
					carModel.getObjectByName( 'rim_rl' ).material = detailsMaterial;
					carModel.getObjectByName( 'trim' ).material = detailsMaterial;

					carModel.getObjectByName( 'glass' ).material = glassMaterial;

					// shadow
					const mesh = new THREE.Mesh(
						new THREE.PlaneGeometry( 0.655 * 4, 1.3 * 4 ),
						new THREE.MeshBasicMaterial( {
							map: shadow, blending: THREE.MultiplyBlending, toneMapped: false, transparent: true
						} )
					);
					mesh.rotation.x = - Math.PI / 2;
					carModel.add( mesh );

					scene.add( carModel );

					render();

				} );

				//

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.toneMapping = THREE.ACESFilmicToneMapping;

				//

				const controls = new OrbitControls( camera, renderer.domElement );
				controls.addEventListener( 'change', render );
				controls.target.set( 0, 2, 0 );
				controls.maxPolarAngle = THREE.MathUtils.degToRad( 90 );
				controls.maxDistance = 80;
				controls.minDistance = 20;
				controls.enablePan = false;
				controls.update();

				document.body.appendChild( renderer.domElement );
				window.addEventListener( 'resize', onWindowResize );

				const gui = new GUI();

				gui.add( params, 'enabled' ).name( 'Grounded' ).onChange( function ( value ) {

					if ( value ) {

						scene.add( skybox );
						scene.background = null;

					} else {

						scene.remove( skybox );
						scene.background = scene.environment;

					}

					render();

				} );

				gui.open();
			
			}

			function onWindowResize() {

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

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

				render();

			}

			function render() {

				renderer.render( scene, camera );

			}
		</script>
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