// instantly move item to floor
public void MoveToFloor(Projectile obj)
{
// trace downwards
Transform t = obj.GlobalTransform;
RayCast rc = new RayCast();
obj.AddChild(rc);
rc.GlobalTransform = t;
rc.CastTo = this.Up * -2000;
rc.ForceRaycastUpdate();
if (rc.IsColliding())
{
t.origin = rc.GetCollisionPoint();
obj.GlobalTransform = t;
}
obj.RemoveChild(rc);
}