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webgl_effects_peppersghost.html
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<!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>