5

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.
Option 2: Corner-Pin the Object Before Tracking
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.
To adjust the four corners of an element and then corner-pin the element
1 Select the foreground object to corner-pin.
2 In the toolbar, choose the Distort tool from the 2D transform tool pop-up menu.
3 In the Canvas, drag each corner of the foreground object into the correct position.
You can fine-tune the corner positions by adjusting the Position, Rotation, Scale, and Four
Corner parameters in the Properties Inspector.
When you drag a corner in the Canvas, the Four Corner checkbox is selected in the
Properties Inspector.
1306 Chapter 22 Motion Tracking