private void TrackerAccelerationChanged(object sender, TrackerAccelChangeEventArgs e)
 {
     if (e.Sensor == HMDTrackerID)
     {
         _hmd.Acceleration = ToXNA(e.Acceleration);
         _hmd.Time         = e.Time;
     }
 }
 private void TrackerAccelerationChanged(object sender, TrackerAccelChangeEventArgs e)
 {
     if (e.Sensor == HMDTrackerID)
     {
         _hmd.Acceleration = ToXNA(e.Acceleration);
         _hmd.Time = e.Time;
     }
 }