Apple Motion 5.1.1 - Manual (Page 962)

Chapter 22 Motion tracking 962
The analyzed track, contained in the Analyze Motion behavior, can now be loaded into other
tracking behaviors (via an Action pop-up menu in the HUD or Inspector of the other tracking
behaviors). In the image below, a track from the Analyze Motion behavior is loaded into a Match
Move behavior HUD.
Note: The Stabilize behavior can only load tracks from other Stabilize behaviors.
Important: Although the Stabilize behavior’s automatic analysis mode starts from the beginning
of a clip (regardless of the playhead’s position), the analysis of other tracking behaviors begins
at the current playhead position for all workflows. To define a tracking region, set an Out point
for the tracked clip. If you are performing a reverse track analysis, set In and Out points for your
track. To set an Out point, position the playhead at the correct frame, select the clip, then choose
Mark > Mark Play Range Out (or press Option-Command-O). To set an In point, position the
playhead at the correct frame, select the clip, then choose Mark > Mark Play Range In (or press
Option-Command-I).
Match Move workflows
Basic Match Move workflows
This section provides an overview of several basic Match Move behavior workflows. For a full
description of Match Move parameters, see
Match Move controls on page 996.
To use a Match Move behavior, you need at least two objects in your project: a background or
source object and a foreground or destination object. The source object provides movement
data based on a tracking analysis of its video or its animation attributes (keyframes or behaviors
applied to a shape, for example). The movement from the source object is then applied to the
destination object. The destination object can be a shape, text, particle emitter, and so on.
Match move a foreground object to a background video clip
In this typical workflow, the Match Move behavior tracks an element of a background video clip
and then applies the resulting track data to a foreground element. As a result, the foreground
element matches the movement of the tracked element in the background clip.
1 Create a Motion project containing a video clip and a shape or image object.
The video clip becomes the background element. The shape or image object serves as the
foreground element.
2 Play the background clip several times to determine a good, clearly defined track analysis point.
3 Select the foreground object, then choose Motion Tracking > Match Move from the Add
Behavior pop-up menu in the toolbar.
A single onscreen tracker (a red crosshair in a circle) is added to the Canvas. Because the default
Match Move tracker records position data, it is known as an anchor tracker. (In the Behaviors
Inspector, you can deactivate this tracker by deselecting the Anchor checkbox.)
4 Determine if you need to activate additional trackers for two- or four-point tracking.
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