3JS_Ball_Rotation

by ikatyang

HTML

<div id="info">demo page</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, scene, renderer, geometry, material, sun, earth, light, controls;
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);

    sun = new THREE.Mesh(new THREE.SphereGeometry(30, 32, 32), new THREE.MeshLambertMaterial());
    scene.add(sun);
    
    earth = new THREE.Mesh(new THREE.SphereGeometry(10, 32, 32), new THREE.MeshLambertMaterial());
    scene.add(earth);

    light = new THREE.PointLight(0xffffff);
    light.position.set(100, 300, 200);
    scene.add(light);

    var gridXZ = new THREE.GridHelper(100, 10);
    gridXZ.setColors(new THREE.Color(0xff0000), new THREE.Color(0xffffff));
    scene.add(gridXZ);

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

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

    document.body.appendChild(renderer.domElement);
    window.addEventListener('resize', onWindowResize, false);
}

function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();
    renderer.setSize(window.innerWidth, window.innerHeight);
}

function animate() {
    angle += 0.05;
    sun.rotation.y = angle;
    earth.rotation.y = angle * 5;
    earth.position.set(50 * Math.cos(angle), 0, 50 * Math.sin(angle));
    controls.update();
    requestAnimationFrame(animate);
    render();
}

function render() {
    renderer.render(scene, camera);
}