the ball isnt moving.

heres an example from the babylonjs docs that might be helpful

var createScene = function () { // This creates a basic Babylon Scene object (non-mesh) var scene = new BABYLON.Scene(engine);

// This creates and positions a free camera (non-mesh) var camera = new BABYLON.FreeCamera("camera1", new BABYLON.Vector3(0, 5, -10), scene);

// This targets the camera to scene origin camera.setTarget(BABYLON.Vector3.Zero());

// This attaches the camera to the canvas camera.attachControl(canvas, true);

// This creates a light, aiming 0,1,0 - to the sky (non-mesh) var light = new BABYLON.HemisphericLight("light", new BABYLON.Vector3(0, 1, 0), scene);

// Default intensity is 1. Let's dim the light a small amount light.intensity = 0.7;

// Our built-in 'sphere' shape. var sphere = BABYLON.MeshBuilder.CreateSphere("sphere", {diameter: 2, segments: 32}, scene);

// Move the sphere upward at 4 units sphere.position.y = 4;

// Our built-in 'ground' shape. var ground = BABYLON.MeshBuilder.CreateGround("ground", {width: 10, height: 10}, scene);

// initialize plugin var hk = new BABYLON.HavokPlugin(); // enable physics in the scene with a gravity scene.enablePhysics(new BABYLON.Vector3(0, -9.8, 0), hk);

// Create a sphere shape and the associated body. Size will be determined automatically. var sphereAggregate = new BABYLON.PhysicsAggregate(sphere, BABYLON.PhysicsShapeType.SPHERE, { mass: 1, restitution:0.75}, scene);

// Create a static box shape. var groundAggregate = new BABYLON.PhysicsAggregate(ground, BABYLON.PhysicsShapeType.BOX, { mass: 0 }, scene);

return scene; };