static public void PrepareTrackingParamsDefault(
     ref xmgTrackingParams trackingParams)
 {
     trackingParams.m_processingSize.w    = 320;
     trackingParams.m_processingSize.h    = 240;
     trackingParams.m_rotate_mode         = 0;
     trackingParams.m_detect_without_eyes = 1;
     trackingParams.texturePtr            = System.IntPtr.Zero;
 }
 static public void PrepareTrackingParams(
     ref xmgTrackingParams trackingParams,
     int proc_w, int proc_h,
     int rotationMode = 0)
 {
     trackingParams.m_processingSize.w    = proc_w;
     trackingParams.m_processingSize.h    = proc_h;
     trackingParams.m_rotate_mode         = rotationMode;
     trackingParams.m_detect_without_eyes = 1;
     trackingParams.texturePtr            = System.IntPtr.Zero;
 }
 public static extern int xzimgFaceApiRigidTracking([In][Out] ref xmgTrackingParams trackingData, [In][Out] ref xmgRigidFaceData rigidData);