Apple Motion 4 - Manual (Page 1252)

• Unstabilize: This behavior does not perform any tracking. Instead, the Unstabilize
behavior applies the movement recorded by another tracking behavior, such as Stabilize,
to a clip or object. This allows you to match the camera shake in a clip to foreground
elements added in post-production. To load the tracking data, choose a track from the
tracking behaviors pop-up menu, located in the tracking behavior HUD or Inspector.
Note: The Unstabilize behavior can be applied to nearly any object type.
Shape Track Points Behavior
The Track Points behavior, a member of the Shape behavior subcategory, allows you to
do either of the following:
• Track the control points of a shape or mask (including paint strokes) to reference features
on a source clip. For example, you can draw a mask around a car in a clip and then
track the control points of the mask to the moving car, cutting the car out of the
background. You can then apply effects to only the isolated car, and the surrounding
image is not affected.
• Apply existing tracking data that was recorded by the Analyze Motion, Match Move,
or Stabilize tracking behavior to the control points of a shape or mask.
Note: The Track Points behavior can be applied only to shapes (including paint strokes)
and masks.
Track Parameter Behavior
The Track Parameter behavior, a member of the Parameter behavior subcategory, allows
you to track a parameter of a filter, such as the Center parameter of a Circle Blur filter, to
a reference feature of a clip.
The tracking data is obtained in one of two ways:
• Once the Track Parameter behavior is added to a filter’s position parameter, a clip can
be analyzed from within the behavior and the recorded data applied to the position
parameter.
• Tracking data from another tracking behavior can be referenced by the Track Parameter
behavior. The recorded data from the referenced behavior is applied to the position
parameter.
Note: The Track Parameter behavior is designed for use with position parameters.
General Motion Tracking Workflow
This section is a general overview of the tracking workflow that is common to most of
the Motion Tracking behaviors. The Analyze Motion behavior is used in this example.
1252 Chapter 19 Motion Tracking