Three JS transparent room

HTML

<script src="http://threejs.org/build/three.min.js"></script>
<script src="http://threejs.org/examples/js/controls/OrbitControls.js"></script>

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.body.appendChild( renderer.domElement );

    // scene
    scene = new THREE.Scene();
    
    // camera
    camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 1000 );
    camera.position.z = 30;
    camera.position.x = 30*Math.cos(290*Math.PI/180);
    camera.position.y = 30*Math.sin(310*Math.PI/180);
    scene.add( camera ); // required, since adding light as child of camera

    // controls
    controls = new THREE.OrbitControls( camera );
    controls.enableZoom = true;
    controls.enablePan = true;
    
    // ambient
    scene.add( new THREE.AmbientLight( 0x444444 ) );
    
    // light
    var light = new THREE.PointLight( 0xffffff, 0.8 );
    camera.add( light );

// !!! important part begins !!!
 var verticesOfCube = [-1,-1,-1,    1,-2.5,1,    1, 1,-1,    -1, 1,-1];
  
  var indicesOfFaces = [2,1,0,    0,3,2,	3,2,1,    1,3,0];

    // geometry
    var geometry = new THREE.PolyhedronGeometry( verticesOfCube, indicesOfFaces, 10, 0 );
    
    // material
    var material1 = new THREE.MeshPhongMaterial( {
        color: 'sandybrown'
    } );
    
    // mesh
    mesh = new THREE.Mesh( geometry, material1 );
    mesh.position.set( 0, 0, 0 );
    scene.add( mesh );
    
    // !!! important part ends !!!
    
    geometry = new THREE.EdgesGeometry( mesh.geometry ); // or WireframeGeometry
  var material = new THREE.LineBasicMaterial( { color: 0xffff00, linewidth: 4 } );
  var edges = new THREE.LineSegments( geometry, material );
    scene.add( edges );
    
}

function animate() {

    requestAnimationFrame( animate );
    
    //controls.update();

    renderer.render( scene, camera );

}