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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>threejs webgl - materials - hdr environment mapping</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="container"></div>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">threejs</a> - High dynamic range (RGBE) Image-based Lighting (IBL)<br />using run-time generated pre-filtered roughness mipmaps (PMREM)<br/>
			Created by Prashant Sharma and <a href="http://clara.io/" target="_blank" rel="noopener">Ben Houston</a>.
		</div>

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

		<script type="module">

			import * as THREE from 'three';

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

			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import { HDRCubeTextureLoader } from 'three/addons/loaders/HDRCubeTextureLoader.js';
			import { RGBMLoader } from 'three/addons/loaders/RGBMLoader.js';
			import { DebugEnvironment } from 'three/addons/environments/DebugEnvironment.js';

			const params = {
				envMap: 'HDR',
				roughness: 0.0,
				metalness: 0.0,
				exposure: 1.0,
				debug: false
			};

			let container, stats;
			let camera, scene, renderer, controls;
			let torusMesh, planeMesh;
			let generatedCubeRenderTarget, ldrCubeRenderTarget, hdrCubeRenderTarget, rgbmCubeRenderTarget;
			let ldrCubeMap, hdrCubeMap, rgbmCubeMap;

			init();

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.set( 0, 0, 120 );

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x000000 );

				renderer = new THREE.WebGLRenderer();
				renderer.toneMapping = THREE.ACESFilmicToneMapping;

				//

				let geometry = new THREE.TorusKnotGeometry( 18, 8, 150, 20 );
				// let geometry = new THREE.SphereGeometry( 26, 64, 32 );
				let material = new THREE.MeshStandardMaterial( {
					color: 0xffffff,
					metalness: params.metalness,
					roughness: params.roughness
				} );

				torusMesh = new THREE.Mesh( geometry, material );
				scene.add( torusMesh );


				geometry = new THREE.PlaneGeometry( 200, 200 );
				material = new THREE.MeshBasicMaterial();

				planeMesh = new THREE.Mesh( geometry, material );
				planeMesh.position.y = - 50;
				planeMesh.rotation.x = - Math.PI * 0.5;
				scene.add( planeMesh );

				THREE.DefaultLoadingManager.onLoad = function ( ) {

					pmremGenerator.dispose();

				};

				const hdrUrls = [ 'px.hdr', 'nx.hdr', 'py.hdr', 'ny.hdr', 'pz.hdr', 'nz.hdr' ];
				hdrCubeMap = new HDRCubeTextureLoader()
					.setPath( './textures/cube/pisaHDR/' )
					.load( hdrUrls, function () {

						hdrCubeRenderTarget = pmremGenerator.fromCubemap( hdrCubeMap );

						hdrCubeMap.magFilter = THREE.LinearFilter;
						hdrCubeMap.needsUpdate = true;

					} );

				const ldrUrls = [ 'px.png', 'nx.png', 'py.png', 'ny.png', 'pz.png', 'nz.png' ];
				ldrCubeMap = new THREE.CubeTextureLoader()
					.setPath( './textures/cube/pisa/' )
					.load( ldrUrls, function () {

						ldrCubeRenderTarget = pmremGenerator.fromCubemap( ldrCubeMap );

					} );


				const rgbmUrls = [ 'px.png', 'nx.png', 'py.png', 'ny.png', 'pz.png', 'nz.png' ];
				rgbmCubeMap = new RGBMLoader().setMaxRange( 16 )
					.setPath( './textures/cube/pisaRGBM16/' )
					.loadCubemap( rgbmUrls, function () {

						rgbmCubeRenderTarget = pmremGenerator.fromCubemap( rgbmCubeMap );

					} );

				const pmremGenerator = new THREE.PMREMGenerator( renderer );
				pmremGenerator.compileCubemapShader();

				const envScene = new DebugEnvironment();
				generatedCubeRenderTarget = pmremGenerator.fromScene( envScene );

				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				container.appendChild( renderer.domElement );

				//renderer.toneMapping = ReinhardToneMapping;

				stats = new Stats();
				container.appendChild( stats.dom );

				controls = new OrbitControls( camera, renderer.domElement );
				controls.minDistance = 50;
				controls.maxDistance = 300;

				window.addEventListener( 'resize', onWindowResize );

				const gui = new GUI();

				gui.add( params, 'envMap', [ 'Generated', 'LDR', 'HDR', 'RGBM16' ] );
				gui.add( params, 'roughness', 0, 1, 0.01 );
				gui.add( params, 'metalness', 0, 1, 0.01 );
				gui.add( params, 'exposure', 0, 2, 0.01 );
				gui.add( params, 'debug' );
				gui.open();

			}

			function onWindowResize() {

				const width = window.innerWidth;
				const height = window.innerHeight;

				camera.aspect = width / height;
				camera.updateProjectionMatrix();

				renderer.setSize( width, height );

			}

			function animate() {

				stats.begin();
				render();
				stats.end();

			}

			function render() {

				torusMesh.material.roughness = params.roughness;
				torusMesh.material.metalness = params.metalness;

				let renderTarget, cubeMap;

				switch ( params.envMap ) {

					case 'Generated':
						renderTarget = generatedCubeRenderTarget;
						cubeMap = generatedCubeRenderTarget.texture;
						break;
					case 'LDR':
						renderTarget = ldrCubeRenderTarget;
						cubeMap = ldrCubeMap;
						break;
					case 'HDR':
						renderTarget = hdrCubeRenderTarget;
						cubeMap = hdrCubeMap;
						break;
					case 'RGBM16':
						renderTarget = rgbmCubeRenderTarget;
						cubeMap = rgbmCubeMap;
						break;

				}

				const newEnvMap = renderTarget ? renderTarget.texture : null;

				if ( newEnvMap && newEnvMap !== torusMesh.material.envMap ) {

					torusMesh.material.envMap = newEnvMap;
					torusMesh.material.needsUpdate = true;

					planeMesh.material.map = newEnvMap;
					planeMesh.material.needsUpdate = true;

				}

				torusMesh.rotation.y += 0.005;
				planeMesh.visible = params.debug;

				scene.background = cubeMap;
				renderer.toneMappingExposure = params.exposure;

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>