examples/webgl_effects_peppersghost.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - effects - peppers ghost</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" target="_blank" rel="noopener">three.js</a> - <a href="https://en.wikipedia.org/wiki/Pepper%27s_ghost">peppers ghost effect</a> demo <br />
			<a href="http://www.instructables.com/id/Reflective-Prism/?ALLSTEPS" target="_blank" rel="noopener">how to build the reflective prism</a>
		</div>

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

		<script type="module">

			import * as THREE from 'three';

			import { PeppersGhostEffect } from 'three/addons/effects/PeppersGhostEffect.js';

			let container;

			let camera, scene, renderer, effect;
			let group;

			init();

			function init() {

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

				camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 100000 );

				scene = new THREE.Scene();

				group = new THREE.Group();
				scene.add( group );

				// Cube

				const geometry = new THREE.BoxGeometry().toNonIndexed(); // ensure unique vertices for each triangle

				const position = geometry.attributes.position;
				const colors = [];
				const color = new THREE.Color();

				// generate for each side of the cube a different color

				for ( let i = 0; i < position.count; i += 6 ) {

					color.setHex( Math.random() * 0xffffff );

					// first face

					colors.push( color.r, color.g, color.b );
					colors.push( color.r, color.g, color.b );
					colors.push( color.r, color.g, color.b );

					// second face

					colors.push( color.r, color.g, color.b );
					colors.push( color.r, color.g, color.b );
					colors.push( color.r, color.g, color.b );

				}

				geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );

				const material = new THREE.MeshBasicMaterial( { vertexColors: true } );

				for ( let i = 0; i < 10; i ++ ) {

					const cube = new THREE.Mesh( geometry, material );
					cube.position.x = Math.random() * 2 - 1;
					cube.position.y = Math.random() * 2 - 1;
					cube.position.z = Math.random() * 2 - 1;
					cube.scale.multiplyScalar( Math.random() + 0.5 );
					group.add( cube );

				}

				renderer = new THREE.WebGLRenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setAnimationLoop( animate );
				container.appendChild( renderer.domElement );

				effect = new PeppersGhostEffect( renderer );
				effect.setSize( window.innerWidth, window.innerHeight );
				effect.cameraDistance = 5;

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

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

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

			}

			function animate() {

				group.rotation.y += 0.01;

				effect.render( scene, camera );

			}

		</script>

	</body>
</html>