/// the initialization (mono-behavior)
    public void Start()
    {
        if (m_manager == null)
        {
            m_manager = FindObjectOfType(typeof(NIPointTrackerManager)) as NIPointTrackerManager;
        }

        m_tracker = m_manager.GetTracker("Primary point tracker (session based)");
        if (m_tracker == null)
        {
            throw new System.Exception("The requested tracker is not attached!");
        }
        m_initialPosition = transform.position;
    }