Three JS transparent room

by murgiaMarco

HTML

<script src="http://threejs.org/build/three.min.js"></script>
<script src="http://threejs.org/examples/js/controls/OrbitControls.js"></script>
<iframe id="ifr" width="600px" height = "400px"><div id ="abc"></div></iframe>

CSS

body {
	background-color: #000;
	margin: 0px;
	overflow: hidden;
}

JavaScript

// Simple three.js example

var mesh, renderer, scene, camera, controls;

init();
animate();

function init() {

    // renderer
    renderer = new THREE.WebGLRenderer();
    renderer.setSize( window.innerWidth, window.innerHeight );
    renderer.setClearColor( 0x889988 );
    document.querySelector('#abc').appendChild( renderer.domElement );

    // scene
    scene = new THREE.Scene();
    
    // camera
    camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 1000 );
    camera.position.set( 20, 20, 20 );
    scene.add( camera ); // required, since adding light as child of camera

    // controls
    controls = new THREE.OrbitControls( camera );
    controls.enableZoom = false;
    controls.enablePan = false;
    controls.maxPolarAngle = Math.PI / 2;
    
    // ambient
    scene.add( new THREE.AmbientLight( 0x444444 ) );
    
    // light
    var light = new THREE.PointLight( 0xffffff, 0.8 );
    camera.add( light );
    
    // axes
    //scene.add( new THREE.AxisHelper( 20 ) );

    // geometry
    var geometry = new THREE.BoxGeometry( 4, 2, 2 );
    
    // material
    var material1 = new THREE.MeshPhongMaterial( {
        color: 'sandybrown'
    } );
    
    // mesh
    mesh = new THREE.Mesh( geometry, material1 );
    mesh.position.set( 2, - 4, 6 );
    scene.add( mesh );

    // geometry
    var geometry = new THREE.BoxGeometry( 2, 2, 2 );
    
    // material
    var material1 = new THREE.MeshPhongMaterial( {
        color: 'gray'
    } );
    
    // mesh
    mesh = new THREE.Mesh( geometry, material1 );
    mesh.position.set( -2 , - 4, - 6 );
    scene.add( mesh );

    // geometry
    var geometry = new THREE.BoxGeometry( 20, 10, 20 );
    
    // material
    var material1 = new THREE.MeshPhongMaterial( {
        color: 0xffffff, 
        transparent: true,
        opacity: 0.1
    } );
    
    // mesh
    mesh = new THREE.Mesh( geometry, material1 );
    scene.add( mesh );
    
    // material
    var material2 =...