Apple Motion 5.1.1 - Manual (Page 989)

Chapter 22 Motion tracking 989
In the following example, the track is obscured by a tree, so the tracker is moved to a nearby
reference pattern, and tracking continues until the original pattern reappears. Even though one
region is examined, the points are saved in another region. The second tracking pattern should
travel in the same direction as your original pattern.
Offset (move) the onscreen tracker control to an unobstructed area of the image
1 Go to the frame where you want to begin the offset track.
When a track is lost during an analysis, Motion jumps back to the frame where the track failed.
The bad track point is identified by an “x” in the Canvas.
You can use the bad track point, or any point before the failed track frame, to move the tracker
and select a new reference feature. In the Canvas, the track point at the current playhead
position is emphasized.
The track point at the current
playhead is highlighted.
2 Select the Offset Track checkbox in the HUD or Behaviors Inspector.
Note: The Offset Track parameter is available in the Analyze Motion, Match Move, Stabilize, Track
Points, and Track Parameter behaviors. Before the parameter becomes available in the Stabilize
behavior, you must add a tracker using the Add button in the Inspector.
3 Drag the tracker to a new, unobscured reference pattern in the Canvas.
4 Click Analyze to restart the motion analysis.
Motion continues to keyframe the trajectory of the original track point, based on the movement
of the new offset reference pattern.
Tip: When you use Offset Track, make sure that the new reference pattern is as close to the
original tracking feature as possible. Ideally, the offset feature should share the same motion as
the originally tracked feature and appear on the same subject.
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