Apple Motion 5.1.1 - Manual (Page 984)

Chapter 22 Motion tracking 984
Tip: The direction in which track points are deleted is determined by the Reverse checkbox
in the Behavior Inspector. When reverse is turned off, each track point you delete moves the
playhead towards the beginning of the clip. When it is turned on, each track point you delete
moves the playhead towards the end of the clip.
Ask Motion for a hint
You can have Motion display suggested tracking points. You need at least one tracker in the
Canvas to display suggested tracking reference points.
m Press the Option key, click a tracker in the Canvas, and hold down the mouse button.
The suggested reference points appear in the Canvas on the footage and in the magnified inset
as small red plus signs.
When you move a tracker toward a suggested point, the tracker snaps to the point. The
suggested points are not necessarily ideal tracking reference points for the feature you want to
track in the clip. Motion is merely picking locations in the current frame that meet the track point
criteria, such as an area of high contrast.
Advanced strategies to improve tracking results
Use the following advanced techniques to improve your tracking results.
Smooth a track curve in the Keyframe Editor
You can smooth a track with the Keyframe Thinning function. Before smoothing the curve,
you might want to copy the behavior (as a backup) to the Library or duplicate the behavior in
the project.
In the following graph, you can see that there’s a keyframe placed at every frame, and the curve
is quite jagged. The following example, shows how you can smooth this curve.
67% resize factor