var camera, scene, renderer, geometry, material, mesh;

​

var num_vertices = 20;

var frame_count = 0;

​

init();

animate();

​

function init() {

​

    scene = new THREE.Scene();

    scene.background = new THREE.Color( 0x999999 )

    camera = new THREE.PerspectiveCamera(50, window.innerWidth /        window.innerHeight, 1, 10000);

    camera.position.z = 500;

    scene.add(camera);

    var light = new THREE.PointLight( 0xffffff, 20 );

    light.position.set( 50, 50, 50 );

    scene.add( light );

    scene.add(new THREE.PointLightHelper(light, 10));

    geometry = new THREE.BufferGeometry();

    var positions = new Float32Array( num_vertices * 3 );

    geometry.addAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );

    material = new THREE.MeshPhongMaterial( {

            color: 0xa48740,

            specular: 0x555555,

            reflectivity: 30,

            shininess: 30,

            side: THREE.DoubleSide

        } );

​

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

    mesh.drawMode = THREE.TriangleStripDrawMode;

    scene.add(mesh);

    var pos = mesh.geometry.attributes.position.array

    var index = 0

    var angle = 0.0

    var lineWeight = 3

    var x = 0;

    var y = 0;

    var z = 0;

    var bool= false;

​

    for ( var i = 0; i < num_vertices; i ++ ) {

      pos[index++] = bool ? x + lineWeight : x -lineWeight;

      pos[index++] = y;

      pos[index++] = bool ? z + Math.sin(angle) * lineWeight : z + Math.sin(angle) * -lineWeight;

​

      bool = !bool;

      angle += 0.4

      y += 10;

​

    }

​

    renderer = new THREE.WebGLRenderer({antialias:true});  

    renderer.setSize(window.innerWidth, window.innerHeight);

    renderer.setFaceCulling(THREE.CullFaceNone);

    document.body.appendChild(renderer.domElement);

​

}

​

function animate() {

​

    requestAnimationFrame(animate);

    render();

​

}

​

function render() {

    mesh.geometry.setDrawRange( 0, Math.floor(frame_count));

    frame_count = (frame_count+0.1) % num_vertices;

    //mesh.rotation.x += 0.01;

    mesh.rotation.y += 0.02;

​

    renderer.render(scene, camera);

​

}