private void StopTracking()
 {
     //Debug.Log ("ServiceManager: Stop Tracking");
     RemoveAllTrackable();
     VisionUnityPlugin.StopAR();
     _enableTracking = false;
 }
        void OnApplicationQuit()
        {
            StopCamera();
            StopThermal();
            StopIMU();
            StopPositionMonitor();

            /*//Debug.Log ("OnApplicationQuit");
             * if (_enableVideoTextureUpdates)
             * {
             *      if (videoBackgroundUsers.Count != 0) {
             *              StopCamera ();
             *      }
             * }
             *
             * if (_enableThermalUpdates)
             * {
             *      if (thermalBackgroundUsers.Count != 0) {
             *              StopThermal ();
             *      }
             * }
             *
             * if (_enableIMU)
             * {
             *      if (imuUsers.Count != 0) {
             *              StopIMU ();
             *      }
             * }
             *
             * if (_enablePose){
             *      if (vioUsers.Count != 0) {
             *              StopIMU ();
             *              StopPositionMonitor ();
             *      }
             * }*/
            if (_enableTracking)
            {
                VisionUnityPlugin.StopAR();
            }
        }