5.5

Table Of Contents
1144Motion User Guide
Track shapes, masks, and paint strokes in Motion
The Track Points behavior (located in the Shape Behaviors category) is designed for use
with shapes, masks, and paint strokes.
Use the Track points behavior in the following ways:
To track the control points of a shape or mask to a clip (for example, when rotoscoping)
To apply tracking data from another tracking analysis to the control points of a shape or
mask
To apply the animation of an object to the control points of a shape or mask
The Track Points behavior does not work with simple shapes (made with the Rectangle,
Circle, and Line tools) because they contain no control points. If you apply a Track Points
behavior to a simple shape, a dialog appears asking if you want to convert the shape to
apply the Shape behavior.
Note: To apply the analyzed movement of an object to a shape or mask as a whole (rather
than to the shape’s individual control points), use the Match Move behavior.
For a full description of the Track Points parameters, see Track Points controls in Motion.
Track a mask using the Track Points behavior
In the following example, the Track Points behavior is applied to a mask with many control
points, isolating a plane in a clip.
1. With a clip visible in the Motion canvas, use a mask tool to isolate part of the clip.
For more information on working with masks, see Intro to masks and transparency in
Motion.
2. In the Layers list, select the mask object, then click Behaviors in the toolbar and choose
Shape > Track Points.
The tracker is applied to the mask.
3. If necessary, drag the footage containing the object you are isolating to the Track
Point’s Source well in the Behaviors Inspector.