Apple Motion 4 - Manual (Page 1279)

In this example, the Track Points behavior is applied to a loose mask of seven control
points isolating a car in a clip.
Note: Keep in mind that paint strokes usually have a very large number of control points.
You should simplify a paint stroke by deleting or disabling control points prior to applying
a Track Points behavior to the stroke. To track the stroke as a whole, rather than by its
control points, use the Match Move behavior.
2 Drag the trackers to fine tune their position on the reference patterns.
As you drag, a magnified view of the area around the tracker appears.
3 To disable a tracker, deselect its checkbox in the Behaviors tab of the Inspector.
Note: Any control points without an associated tracker are not modified.
4 Click the Analyze button in the HUD or Behaviors tab of the Inspector.
The mask control points are tracked to the reference patterns.
1279 Chapter 19 Motion Tracking