2011

as it is not going to be modifying the image but rather, you will be using
data associated with that tracker.
3 Attach the composition to the input of the tracker.
4 Add a second Tracker Analyzer
5 Place the first Tracker over the pivot point of the rotation you want to
track.
6 Click Analyze Forward to analyze the footage.
7 Go back to the first frame.
8 Place the second tracker over an area that describes the axis of the rotation
you want to apply.
9 Click Analyze Forward to analyze the footage.
10 Drag a Reaction tool from the Tools tab and place it on the dependency
graph between the footage node and the Output node.
11 With the cursor over the Reaction node, right-click and select Add Source.
12 To associate a layer with the source you just created, select Bilinear at the
bottom of the Layer Editor and click Create.
13 In the Layer Editor, right-click inside the Z field under Rotation and select
Track Rotation.
The Tracker Selector browser appears.
14 Using Ctrl + click, select both the trackers then click Link.
The rotation has been tracked.
NOTE When tracking data needs to be applied to more than one layer in a
composition, add an extra axis node to the dependency graph and connect it to
the appropriate layers. Linking the axis to several layers facilitates panning multiple
objects inside a reaction. In this case, you would then click the axis node at step
13 instead of the Layers node, and continue the procedure.
776 | Chapter 32 Tracking and Stabilizing