PanUpdated.cs

void PanUpdated(object sender, PanUpdatedEventArgs e)
{
    switch (e.StatusType)
    {
        case GestureStatus.Running:
            if (ScreenWidth > 0 && ScreenHeight > 0)
            {
                double range = Math.Max(ScreenWidth, ScreenHeight);
                float yaw = (float)(Fov * -e.TotalX / range);// up/down
                float pitch = (float)(Fov * -e.TotalY / range);// left/right
                MediaPlayer.UpdateViewpoint(Yaw + yaw, Pitch + pitch, Roll, Fov);
            }
            break;
        case GestureStatus.Started:
        case GestureStatus.Canceled:
            break;
        case GestureStatus.Completed:
            Fov = MediaPlayer.Viewpoint.Fov;
            Pitch = MediaPlayer.Viewpoint.Pitch;
            Roll = MediaPlayer.Viewpoint.Roll;
            Yaw = MediaPlayer.Viewpoint.Yaw;
            break;
    }
}