Apple Motion 5.1.1 - Manual (Page 960)

Chapter 22 Motion tracking 960
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The Track Points behavior analyzes and applies the control point movement of shapes,
masks, and paint strokes. See
Track Points workflow on page 974 and Track Points controls on
page 1003.
•
The Track behavior tracks a object’s position parameter to a clip, or applies tracking data to a
position parameter. See
Track behavior workflow on page 978 and Track controls on page 1006.
Analyze Motion workflow
The Analyze Motion behavior analyzes and stores tracking data from a clip but does not
transform the tracked object. Analyze Motion data tracks are meant to be referenced by other
tracking behaviors.
For a full description of Analyze Motion parameters, see Analyze Motion controls on page 994.
Tracking in one pass rarely yields perfect results. For information on tracking methods and tips,
see
Basic strategies to improve tracking results on page 981.
Generate a track for a clip using the Analyze Motion behavior
1 In the Layers list, Timeline, or Canvas, select the video object to track, then choose Motion
Tracking > Analyze Motion from the Add Behavior pop-up menu in the toolbar.
Note: You can also select the video object, select the Analyze Motion behavior in the Library,
then click the Apply button in the Library preview area. Alternatively you can drag the behavior
from the Library to the video object in the Layers list, Timeline, or Canvas.
An onscreen tracker is added to the footage. By default, a single tracker appears at the center of
the footage.
2 Play your background clip several times to determine a good reference point in the footage, then
move the playhead to the frame where you want to start the track analysis.
3 In the Canvas, drag the tracker to the reference point you want to use.
Note: For more information on using the onscreen tracker, see Adjust onscreen trackers on
page 978. For more information on selecting a tracking reference point, see Basic strategies to
improve tracking results on page 981.
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