Apple Shake 4 - Manual (Page 723)

Chapter 25 Image Tracking, Stabilization, and SmoothCam 723
Note: For four-point MatchMove and Stabilize operations, the trackers should be
positioned in a counterclockwise order, starting in the lower-left corner. This ensures
the proper alignment of your element when the transformation is applied.
If the reference pattern you are tracking goes offscreen, or becomes obscured by
another object, Shake’s default behavior is to stop the tracking analysis. You can use the
Offset Track button to reposition the reference pattern in the Viewer. When you restart
the tracking process, Shake will continue its motion analysis based on the new
reference pattern, but will update (and keyframe) the original tracking point.
To offset (move) the onscreen tracker control to an unobstructed area of the
image:
1 Cick the Offset Tracker button in the Viewer shelf.
2 Drag the onscreen tracker control (but not the tracking point crosshairs) to a better
position in the Viewer.
3 Click the Track Forward or Track Backward button in the Viewer shelf to restart the
motion analysis.
Shake continues to keyframe the movement of the original tracking point, based on
the movement of the new, offset reference pattern.
Note: When you use the Offset Track function, be sure that the new reference pattern is
in the same perspective plane as the originally tracked feature. If the two features are
not approximately the same distance from the camera, the parallax effect will result in
inaccurate motion tracking.
Offset Track
button disabled
Offset Track
button enabled