Apple Shake 4 - Manual (Page 724)

724 Chapter 25 Image Tracking, Stabilization, and SmoothCam
4 To reset the search area back to the original tracking point, click the Reset Track button.
You can turn off a tracker using the controls in the Parameters tab.
To turn off a specific tracker:
m Click the Visibility button located next to the track name in the Parameters tab.
All visible trackers are processed when you click the track button, regardless of whether
they have previously tracked keys. When Visibility is disabled for a tracker, that track is
not processed.
A limitation of the MatchMove node is that it does not handle the pass-through of
upstream onscreen controls, so those controls are in their untransformed state.
Viewer Shelf Controls
The following table describes the Viewer shelf buttons that become available with the
tracking nodes.
Reset Track
button
Visibility button
Button Description
Track Backward/
Track Forward Click to start the tracking process. All visible
trackers attempt to lay down new tracking
keyframes. Tracking continues until one of the
trackRange frame limits is reached—the upper
limit if you are tracking forward or the lower limit if
you are tracking backward, or until your correlation
falls below your failureTolerance setting.
Offset Track–Off The track search region and the tracking point are
linked. If you move one, the other follows.
Offset Track–On The track search region and the tracking point are
offset from each other. If your original sample
pattern becomes obscured, offset the search
region to a different area. Your keyframes are still
saved relative to the original spot.
Reset Track Returns an offset track search region back to the
track point.