Apple Motion 4 - Manual (Page 1268)

Option 3: Transform the Object Prior to Corner-Pinning
In this workflow, a foreground object is transformed to fit a background picture frame
using the scale, rotation, and position parameters in the Properties tab prior to applying
the Match Move behavior. This workflow is helpful when the “pinned” image needs fine
tuning, such as scaling, rotating, or cropping prior to being tracked.
To transform and corner-pin an image
1 Select the foreground element you want to corner-pin.
2 Using the onscreen transform controls or the Properties tab of the Inspector, adjust the
foreground element’s scale, position, or rotation to its “frame.”
3 Go to the frame where you want to start the track and apply the Match Move behavior
to the transformed element.
4 Choose Four Corners from the Type pop-up menu in the Behaviors tab of the Inspector.
5 Do one of the following:
• To position the trackers without changing the shape of the foreground image, choose
Mimic Source from the Transform pop-up menu, then position the trackers on the
reference patterns of the background image (in this example, the four inside corners
of the picture frame). In the image below, the tracker is being positioned in the Canvas,
but the foreground image is not affected because Mimic Source is chosen from the
Transform pop-up menu.
1268 Chapter 19 Motion Tracking