5.1.1

Chapter 22 Motion tracking 959
Note: The Track Points behavior can be applied only to shapes (including paint strokes)
and masks.
Track
The Track behavior, a member of the Parameter behavior subcategory, lets you match the
position parameters of shapes, clips, or lters (such as the Center parameter of a Circle Blur lter)
to a reference feature of a clip.
The tracking data is obtained in one of two ways:
•
After you add the Track behavior to a position parameter, another clip is analyzed in the Track
behavior, and the recorded data is applied to that position parameter.
•
Tracking data from another tracking behavior is referenced by the Track behavior. The
recorded data from the referenced behavior is applied to the position parameter.
Note: Although it’s a Parameter behavior, the Track behavior is only designed for use with
position parameters.
About tracking behavior data
If the project contains footage or animated objects when a Match Move, Stabilize, Unstabilize, or
Track Points behavior is applied, the nearest footage or animated object below the behavior in
the Layers list is applied to the tracking behavior and appears in the behavior’s Source well. This
data is overwritten when you choose another track from the Action pop-up menu.
You can assign an animated object or tracking data to a tracking behavior in any of four ways:
•
Choose another tracking behavior from the Action pop-up menu.
•
Drag a tracking behavior or footage object to the Source well in the HUD or
Behaviors Inspector.
•
Drag an animated object to the Source well in the HUD or Behaviors Inspector. The referenced
animated object is applied as the source for the current behavior. (This option applies only to
the Match Move and Track Points behaviors.)
•
Drag a tracking behavior or footage object to the tracking behavior in the Layers list.
The referenced tracking behavior or footage object is assigned as the source for the
current behavior.
Note: To clear a Source well, drag the item away from the well and release the mouse button.
Tracking workows
Tracking workows overview
Motion’s tracking behaviors perform many dierent tasks:
•
The Analyze Motion behavior analyzes the movement of a clip at a reference point you select,
and saves the analyzed data. This data can then be applied to other objects. See Analyze
Motion workow on page 960 and Analyze Motion controls on page 994.
•
The Match Move behavior applies the movement data of a source object to a destination
object. See Basic Match Move workows on page 962 and Match Move controls on page 996.
•
The Stabilize behavior smoothes motion in a clip. See Stabilize workow on page 971 and
Stabilize controls on page 1001.
•
The Unstabilize behavior applies movement analyzed using the Stabilize behavior to another
object. See Unstabilize workow on page 974.
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