dynamicsWorld = new DiscreteDynamicsWorld(dispatcher, overlappingPairCache, constraintSolver, collision_config);
dynamicsWorld.setGravity(new Vector3f(0f, -30f, 0f));
dynamicsWorld.setDebugDrawer(new GLDebugDrawer(gl));
// Setup a big ground box
{
CollisionShape groundShape = new BoxShape(new Vector3f(200f, 10f, 200f));
Transform groundTransform = new Transform();