public void ResetTrackers()
    {
        Debug.Log("ResetTrackers() called.");

        m_SmartTerrain            = TrackerManager.Instance.GetTracker <SmartTerrain>();
        m_PositionalDeviceTracker = TrackerManager.Instance.GetTracker <PositionalDeviceTracker>();

        // Stop and restart trackers
        m_SmartTerrain.Stop(); // stop SmartTerrain tracker before PositionalDeviceTracker
        //m_PositionalDeviceTracker.Reset();
        m_PositionalDeviceTracker.ResetAnchors();
        m_SmartTerrain.Start(); // start SmartTerrain tracker after PositionalDeviceTracker
    }