spot light & shadow

with orbitControls, XZgrid, info

HTML

<div id="info">spot light
    <br/>Press Z to toggle</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>
<script src="http://jyunming-chen.github.io/tutsplus/js/KeyboardState.js"></script>

CSS

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

JavaScript

var camera, scene, renderer, geometry, material, mesh, spotLight, controls;
var keyboard = new KeyboardState();
var turn = true;
var angle = 0;

init();
animate();

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

    camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 1000);
    camera.position.z = 500;
    scene.add(camera);

    geometry = new THREE.BoxGeometry(20, 20, 20);
    material = new THREE.MeshLambertMaterial({color:0xff1234});

    mesh = new THREE.Mesh(geometry, material);
    scene.add(mesh);

    spotLight = new THREE.SpotLight(0xffffff, 1.3);
    spotLight.position.set(200, 500, 400);
    spotLight.angle = Math.PI / 12;

    spotLight.castShadow = true;

    spotLight.shadowMapWidth = 1024;
    spotLight.shadowMapHeight = 1024;

    spotLight.shadowCameraNear = 500;
    spotLight.shadowCameraFar = 4000;
    spotLight.shadowCameraFov = 30;

    spotLight.exponent  = 150;
    scene.add(spotLight);

    /*
    light = new THREE.PointLight(0xffffff);
    light.position.set(100, 300, 200);
    scene.add(light);
*/
    var ground = new THREE.Mesh(
    new THREE.PlaneGeometry(400, 400, 130,130),
    new THREE.MeshLambertMaterial());
    ground.rotation.x = -Math.PI / 2;
    scene.add(ground);
    /*        
    var gridXZ = new THREE.GridHelper(100, 10);
    gridXZ.setColors(new THREE.Color(0xff0000), new THREE.Color(0xffffff));
    scene.add(gridXZ);
*/

    ground.receiveShadow = true;
    mesh.castShadow = true;

    spotLight.target = mesh;

    renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);
    renderer.setClearColor(0x888888);
    renderer.shadowMapEnabled = true;
    renderer.shadowMapType = THREE.PCFShadowMap;

    controls = new THREE.OrbitControls(camera, renderer.domElement);

    document.body.appendChild(renderer.domElement);
}

function animate() {
    controls.update();
    keyboard.update();

    if (keyboard.down("Z")) turn = !turn;
    if (turn) angle...