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three.js
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - materials - cube refraction [Lucy]</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="info">
			<a href="https://threejs.org">Three.js</a> cube map refraction demo<br/>
			Lucy model from <a href="http://graphics.stanford.edu/data/3Dscanrep/">Stanford 3d scanning repository<br/>
			Texture by <a href="http://www.humus.name/index.php?page=Textures" target="_blank" rel="noopener">Humus</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 { PLYLoader } from 'three/addons/loaders/PLYLoader.js';

			let container, stats;

			let camera, scene, renderer;

			let mouseX = 0, mouseY = 0;

			let windowHalfX = window.innerWidth / 2;
			let windowHalfY = window.innerHeight / 2;

			init();

			function init() {

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

				camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 100000 );
				camera.position.z = - 4000;

				//

				const r = 'textures/cube/Park3Med/';

				const urls = [
					r + 'px.jpg', r + 'nx.jpg',
					r + 'py.jpg', r + 'ny.jpg',
					r + 'pz.jpg', r + 'nz.jpg'
				];

				const textureCube = new THREE.CubeTextureLoader().load( urls );
				textureCube.mapping = THREE.CubeRefractionMapping;

				scene = new THREE.Scene();
				scene.background = textureCube;

				// LIGHTS

				const ambient = new THREE.AmbientLight( 0xffffff, 3.5 );
				scene.add( ambient );

				// material samples

				const cubeMaterial3 = new THREE.MeshPhongMaterial( { color: 0xccddff, envMap: textureCube, refractionRatio: 0.98, reflectivity: 0.9 } );
				const cubeMaterial2 = new THREE.MeshPhongMaterial( { color: 0xccfffd, envMap: textureCube, refractionRatio: 0.985 } );
				const cubeMaterial1 = new THREE.MeshPhongMaterial( { color: 0xffffff, envMap: textureCube, refractionRatio: 0.98 } );

				//

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				container.appendChild( renderer.domElement );

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

				const loader = new PLYLoader();
				loader.load( 'models/ply/binary/Lucy100k.ply', function ( geometry ) {

					createScene( geometry, cubeMaterial1, cubeMaterial2, cubeMaterial3 );

				} );

				document.addEventListener( 'mousemove', onDocumentMouseMove );

				//

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

				windowHalfX = window.innerWidth / 2;
				windowHalfY = window.innerHeight / 2;

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

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

			}

			function createScene( geometry, m1, m2, m3 ) {

				geometry.computeVertexNormals();

				const s = 1.5;

				let mesh = new THREE.Mesh( geometry, m1 );
				mesh.scale.x = mesh.scale.y = mesh.scale.z = s;
				scene.add( mesh );

				mesh = new THREE.Mesh( geometry, m2 );
				mesh.position.x = - 1500;
				mesh.scale.x = mesh.scale.y = mesh.scale.z = s;
				scene.add( mesh );

				mesh = new THREE.Mesh( geometry, m3 );
				mesh.position.x = 1500;
				mesh.scale.x = mesh.scale.y = mesh.scale.z = s;
				scene.add( mesh );

			}

			function onDocumentMouseMove( event ) {

				mouseX = ( event.clientX - windowHalfX ) * 4;
				mouseY = ( event.clientY - windowHalfY ) * 4;

			}

			//

			function animate() {

				render();
				stats.update();

			}

			function render() {

				camera.position.x += ( mouseX - camera.position.x ) * .05;
				camera.position.y += ( - mouseY - camera.position.y ) * .05;

				camera.lookAt( scene.position );

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>