javascript
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three.js
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>threejs webgl - materials - equirectangular exr image based lighting</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				color: #fff;
				font-family:Monospace;
				font-size:13px;
				text-align:center;

				background-color: #000;

				margin: 0px;
				overflow: hidden;
			}
			a { color: #00f }

			#info {
				position: absolute;
				top: 0px; width: 100%;
				padding: 5px;
			}
		</style>
	</head>
	<body>

		<div id="container"></div>
		<div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">threejs</a> - Example of an IBL (Image based lighting) pipeline based around<br> equirectangular EXR lightprobe data. Created by <a href="https://github.com/richardmonette" target="_blank" rel="noopener">Richard Monette</a></div>

		<script src="../build/three.js"></script>
		<script src="js/controls/OrbitControls.js"></script>

		<script src="js/loaders/EXRLoader.js"></script>
		<script src="js/loaders/EquirectangularToCubeGenerator.js"></script>

		<script src="js/WebGL.js"></script>
		<script src="js/libs/stats.min.js"></script>

		<script src="js/pmrem/PMREMGenerator.js"></script>
		<script src="js/pmrem/PMREMCubeUVPacker.js"></script>
		<script src="js/libs/dat.gui.min.js"></script>

		<script>

			if ( WEBGL.isWebGLAvailable() === false ) {

				document.body.appendChild( WEBGL.getWebGLErrorMessage() );

			}

			var container, stats;
			var params = {
				envMap: 'EXR',
				roughness: 0.0,
				metalness: 0.0,
				exposure: 1.0,
				showBackground: true,
			};
			var camera, scene, renderer, controls, objects = [];
			var standardMaterial, floorMaterial;
			var pngCubeRenderTarget, exrCubeRenderTarget;
			var pngBackground, exrBackground;

			init();
			animate();

			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.LinearToneMapping;

				standardMaterial = new THREE.MeshStandardMaterial( {
					map: null,
					color: 0xffffff,
					metalness: params.roughness,
					roughness: params.metalness,
					envMapIntensity: 1.0
				} );

				var geometry = new THREE.TorusKnotBufferGeometry( 18, 8, 150, 20 );

				var torusMesh1 = new THREE.Mesh( geometry, standardMaterial );

				scene.add( torusMesh1 );
				objects.push( torusMesh1 );

				floorMaterial = new THREE.MeshBasicMaterial( {
					color: 0xffffff
				} );

				var planeGeometry = new THREE.PlaneBufferGeometry( 200, 200 );
				var planeMesh1 = new THREE.Mesh( planeGeometry, floorMaterial );
				planeMesh1.position.y = - 50;
				planeMesh1.rotation.x = - Math.PI * 0.5;
				scene.add( planeMesh1 );

				new THREE.EXRLoader().load( 'textures/piz_compressed.exr', function ( texture ) {

					texture.minFilter = THREE.NearestFilter;
					texture.magFilter = THREE.NearestFilter;
					texture.encoding = THREE.LinearEncoding;

					var cubemapGenerator = new THREE.EquirectangularToCubeGenerator( texture, { resolution: 512, type: THREE.HalfFloatType } );
					exrBackground = cubemapGenerator.renderTarget;
					var cubeMapTexture = cubemapGenerator.update( renderer );

					var pmremGenerator = new THREE.PMREMGenerator( cubeMapTexture );
					pmremGenerator.update( renderer );

					var pmremCubeUVPacker = new THREE.PMREMCubeUVPacker( pmremGenerator.cubeLods );
					pmremCubeUVPacker.update( renderer );

					exrCubeRenderTarget = pmremCubeUVPacker.CubeUVRenderTarget;

					texture.dispose();
					pmremGenerator.dispose();
					pmremCubeUVPacker.dispose();

				} );

				new THREE.TextureLoader().load( 'textures/equirectangular.png', function ( texture ) {

					texture.encoding = THREE.sRGBEncoding;

					var cubemapGenerator = new THREE.EquirectangularToCubeGenerator( texture, { resolution: 512 } );
					pngBackground = cubemapGenerator.renderTarget;

					var cubeMapTexture = cubemapGenerator.update( renderer );

					var pmremGenerator = new THREE.PMREMGenerator( cubeMapTexture );
					pmremGenerator.update( renderer );

					var pmremCubeUVPacker = new THREE.PMREMCubeUVPacker( pmremGenerator.cubeLods );
					pmremCubeUVPacker.update( renderer );

					pngCubeRenderTarget = pmremCubeUVPacker.CubeUVRenderTarget;

					texture.dispose();
					pmremGenerator.dispose();
					pmremCubeUVPacker.dispose();

				} );

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

				container.appendChild( renderer.domElement );

				renderer.gammaInput = false;
				renderer.gammaOutput = true;

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

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

				window.addEventListener( 'resize', onWindowResize, false );

				var gui = new dat.GUI();

				gui.add( params, 'envMap', [ 'EXR', 'PNG' ] );
				gui.add( params, 'roughness', 0, 1 );
				gui.add( params, 'metalness', 0, 1 );
				gui.add( params, 'exposure', 0, 2 );
				gui.add( params, 'showBackground', true);
				gui.open();

			}

			function onWindowResize() {

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

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

				renderer.setSize( width, height );

			}

			function animate() {

				requestAnimationFrame( animate );

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

			}

			function render() {

				standardMaterial.roughness = params.roughness;
				standardMaterial.metalness = params.metalness;

				var newEnvMap = standardMaterial.envMap;

				switch ( params.envMap ) {

					case 'EXR':
						newEnvMap = exrCubeRenderTarget ? exrCubeRenderTarget.texture : null;
						background = exrBackground;
						break;
					case 'PNG':
						newEnvMap = pngCubeRenderTarget ? pngCubeRenderTarget.texture : null;
						background = pngBackground;
						break;

				}

				if ( newEnvMap !== standardMaterial.envMap ) {

					standardMaterial.envMap = newEnvMap;
					standardMaterial.needsUpdate = true;

					floorMaterial.map = newEnvMap;
					floorMaterial.needsUpdate = true;

				}

				if ( ! params.showBackground ) {

					scene.background = null;

				} else {

					scene.background = background;

				}


				renderer.toneMappingExposure = params.exposure;

				for ( var i = 0, l = objects.length; i < l; i ++ ) {

					var object = objects[ i ];
					object.rotation.y += 0.005;

				}

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>