Apple Motion 5.1.1 - Manual (Page 967)

Chapter 22 Motion tracking 967
The foreground element is pinned to the background element; four motion paths show the
transformation occurring at each corner.
Note: In this example, a reflection is created on the table using a duplicated and transformed
copy of the tracked image.
To fine-tune the track (when Four Corners is chosen from the Type pop-up menu), you might
need to make minor adjustments to the foreground element, such as modifying its scale or
rotation. When you choose the Attach to Source option from the Transform pop-up menu in the
Behaviors Inspector, you cannot transform the tracked object. To transform the tracked object,
choose Mimic Source from the Transform pop-up menu.
5 To transform the foreground element after the tracking data is applied:
a From the Transform pop-up menu in the Behaviors Inspector, choose Mimic Source.
b Open the Properties Inspector and make any necessary adjustments to the foreground object
using the Scale, Rotation, and other parameters.
For more information on the Mimic Source and Attach to Source transform options, see Match
Move controls on page 996.
Use onscreen controls to corner-pin a foreground object
In this workflow, a foreground object is pinned to a background picture frame using the Four
Corner parameter in the Properties Inspector before applying the Match Move behavior.
1 Select the foreground object to corner-pin.
2 In the toolbar, choose the Distort tool from the 2D transform tool pop-up menu.
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