skybox (dynamic cubemap)

HTML

<div id="info">skybox (dynamic cubemap)</div>
<script src="http://cdnjs.cloudflare.com/ajax/libs/three.js/r70/three.min.js"></script>
<script src="https://dl.dropboxusercontent.com/u/3587259/Code/Threejs/OrbitControls.js">
    
</script>

CSS

#info {
    position: absolute;
    top: 0px;
    width: 100%;
    padding: 10px;
    text-align: center;
    color: #ffff00
}
body {
    overflow: hidden;
}

JavaScript

var camera, cubeCamera, scene, renderer;
var cube, sphere, torus;
var controls;

init();
animate();


function init() {
    scene = new THREE.Scene();

    camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 10000);
    camera.position.set (0,80,80);
    scene.add(camera);

    renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);
    renderer.setClearColor(0x880000);

    document.body.appendChild(renderer.domElement);


    /////////////////////////////////////////////////////////////////////////
    /// pure skybox
       THREE.ImageUtils.crossOrigin = '';
    var pztex = THREE.ImageUtils.loadTexture(
        "http://i.imgur.com/yEOMzQg.jpg");
    var pytex = THREE.ImageUtils.loadTexture(
        "http://i.imgur.com/nVMAfLw.jpg");
    var pxtex = THREE.ImageUtils.loadTexture(
        "http://i.imgur.com/EnD4hQd.jpg");
    var nztex = THREE.ImageUtils.loadTexture(
        "http://i.imgur.com/GhEpGuR.jpg");
    var nytex = THREE.ImageUtils.loadTexture(
        "http://i.imgur.com/k6UxiiZ.jpg");
    var nxtex = THREE.ImageUtils.loadTexture(
        "http://i.imgur.com/tUboeCr.jpg");

    var materialArray = [];
    materialArray.push(new THREE.MeshBasicMaterial({
        map: pxtex,
        side: THREE.BackSide
    }));
    materialArray.push(new THREE.MeshBasicMaterial({
        map: nxtex,
        side: THREE.BackSide
    }));
    materialArray.push(new THREE.MeshBasicMaterial({
        map: pytex,
        side: THREE.BackSide
    }));
    materialArray.push(new THREE.MeshBasicMaterial({
        map: nytex,
        side: THREE.BackSide
    }));
    materialArray.push(new THREE.MeshBasicMaterial({
        map: pztex,
        side: THREE.BackSide
    }));
    materialArray.push(new THREE.MeshBasicMaterial({
        map: nztex,
        side: THREE.BackSide
    }));

    var skyboxGeometry = new THREE.BoxGeometry(500, 500, 500);
    var skyboxMaterial = new...