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76 Chapter 2 Motion Tracking
Track Points Workflow
The Track Points behavior is designed for use with shapes and masks. The Track points
behavior can be used in the following ways:
 Track the control points of a shape or mask to a clip.
 Apply tracking data from another tracking analysis to the control points of a shape or
mask.
 Apply the animation of an object to the control points of a shape or mask.
Note: To apply the analyzed movement of an object to a shape or mask as a whole (not
to the shape’s control points), use the Match Move behavior.
For a full description of the Track Points parameters, see “Track Points Controls” on
page 109.
Tracking Control Points to a Clip
This section provides a brief overview of using the Track Points behavior to track the
vertices of a shape or mask to a clip.
To track a shape or mask using the Track Points behavior:
1 Select the shape or mask you want to track, click the Add Behavior icon in the Toolbar,
then choose Shapes > Track Points from the pop-up menu.
The behavior is added to the shape, and trackers appear for each control point on the
shape. The trackers are ordered in the same order that the shape was drawn: Control
Point 1 is Track 1, Control Point 2 is Track 2, and so on.
Note: Trackers are not added to disabled shape control points. You can still enable and
disable control points once a Track Points behavior is applied to a shape. For more
information on working with shape control points, see Chapter 12, “Using Shapes and
Masks,” in the Motion 3 User Manual.
In this example, the Track Points behavior is applied to a loose mask of seven control
points isolating a car in a clip.