Apple Motion 4 - Manual (Page 1290)

To delete bad track points in the Canvas after analysis is complete
1 With the tracking analysis complete and the tracking behavior selected, move the playhead
to the frame with the track point (or start of the track points) you want to delete.
2 In the toolbar, ensure that the Adjust Item tool is selected.
3 Ensure that a track point is active in the Canvas.
You may want to zoom into the Canvas in order to better see the active track points. The
track point at the current playhead position appears larger than other track points.
4 Press the Delete key. Each press of the key removes one track point.
Smoothing Tracking Keyframe Curves
You can smooth a track with the Keyframe Thinning function in the Animation menu in
the Keyframe Editor parameter list. Prior to smoothing the curve, you may want to copy
the behavior (as a backup) to the Library or duplicate the behavior in the project.
To smooth a track curve
1 In the Keyframe Editor, click the Animation menu for the track you want to smooth, then
choose Reduce Keyframes from the pop-up menu.
Before the curve is
simplified, a keyframe
appears at every frame.
The Reduce Keyframes dialog appears.
Reduce Keyframes applies a thinning algorithm to the keyframes for the chosen parameter.
This reduces the number of keyframes in a parameter while attempting to maintain a
similar shape to the curve. The thinning algorithm can be adjusted in two ways. Increasing
the Maximum Error Tolerance results in fewer keyframes. Increasing the Smoothing Factor
makes smoother curves between keyframe values.
1290 Chapter 19 Motion Tracking