5

Track Points Controls
The Track Points behavior allows you to link the control points of a shape or mask
(including paint strokes) to reference features on a source clip. This behavior also allows
you to apply tracking data recorded by the Analyze Motion, Match Move, or Stabilize
tracking behaviors to the control points of a shape or mask.
The Track Points behavior can be found in the Behaviors’ Shape subcategory in the Library,
or by choosing Shape > Track Points from the Add Behavior pop-up menu in the toolbar.
For information on using the Track Points behavior, see Track Points Workflow.
Parameters in the Inspector
Source: Use to drag a source object for the track points to this well. The source object
can be another tracking behavior, an animated object, or a footage object. To clear a
Source well, drag the item away from the well and release the mouse button.
• Action pop-up menu: Choose from a list of tracking data (from other tracking behaviors)
in the project.
Transform: Use this pop-up menu to choose how the destination object moves. There
are two options:
• Attach to Source: This option anchors the foreground object to the recorded track or
animation source. Use Attach to Source when the source object is scaling or rotating,
and you want the destination object to “stick” to a specific spot on the source object.
Any animation that existed on the destination object before applying the track can be
preserved by using the Adjust parameters (Position, Scale, and Rotation), available
when Transformation is chosen from the Type pop-up menu.
Note: Although the destination object is attached to the movement of the source
object, the destination object can be offset from the source object.
• Mimic Source: This option allows the destination object to “mimic” the recorded track
or animation source. Any animation that existed on the foreground object before
applying the track can be added to the track by selecting Position, Rotation, or Scale
in the Adjust parameters.
Note: As with Attach to Source, the destination object can be offset from the source
object.
Align Tangents: When this checkbox is deselected, tangents remain aligned at their
original angles. When the checkbox is selected, the tangents match the transformation
of the source animation, and the shape changes its form.
1355Chapter 22 Motion Tracking