SOURCE

window.onload = function () {
    var scene = new THREE.Scene();
    var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
    var renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);
    document.body.appendChild(renderer.domElement);
    var geometry = new THREE.CubeGeometry(1, 1, 1);
    var material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
    var cube = new THREE.Mesh(geometry, material); 
    scene.add(cube);
    camera.position.z = 2;
    function render() {
        requestAnimationFrame(render);
        cube.rotation.x += 0.01;
        cube.rotation.y +=0.01;
        renderer.render(scene, camera);
    }
    render();
};