three.js testbed

with orbitControls, XZgrid, info

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, mesh, light, controls;

init();
animate();

function myCylinder (head, tail, radius) {
	var r = radius || 1;
    var h = head.distanceTo (tail);
    var geometry = new THREE.CylinderGeometry (r,r,h);
    var group = new THREE.Object3D();
    var mesh = new THREE.Mesh (geometry, new THREE.MeshNormalMaterial());
    group.add (mesh);
    mesh.position.set (0,h/2,0);  // move cylinder to +y, starting from (0,0,0)
    
    // rotate to the due orientation
    var v = tail.clone(); // v = tail
    v.sub (head).normalize();  // v = norm (tail - head)
    
    var angle = Math.acos (v.dot(new THREE.Vector3(0,1,0)));
    var axis= new THREE.Vector3();
    axis.crossVectors (new THREE.Vector3(0,1,0), v).normalize();
    group.rotateOnAxis (axis, angle);
                           
    // translation to head
    group.position.copy (head);
    return group;
}

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

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

    mesh = myCylinder (new THREE.Vector3 (5,5,5), new THREE.Vector3 (20,20,25));
    scene.add(mesh);

    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...