// Use this for initialization
 void Start()
 {
     rotations = new Queue<Quaternion>(smoothingFrames);
     positions = new Queue<Vector3>(smoothingFrames);
     qcarBehavior = GetComponent<VuforiaBehaviour>();
     //qcarBehavior.RegisterTrackerEventHandler(this);
     qcarBehavior.RegisterVuforiaStartedCallback(OnInitialized);
     qcarBehavior.RegisterTrackablesUpdatedCallback(OnTrackablesUpdated);
 }