Apple Motion 5.1.1 - Manual (Page 966)

Chapter 22 Motion tracking 966
2 In the Behaviors Inspector, choose Four Corners from the Type pop-up menu.
Note: The Four Corners option is not available when Match Move is applied to a 3D group. To
corner-pin a 3D group, select the Flatten checkbox in the Group Inspector.
In the Canvas, a tracker appears at each corner of the foreground object’s bounding box. In the
Inspector, the default track list (Anchor and Rotation-Scale), is replaced with the Top Left, Top
Right, Bottom Right, and Bottom Left trackers.
As with the Analyze Motion trackers, when you drag a tracker to a new position in the Canvas, a
magnified inset appears to help you position each tracker.
3 In the Canvas, drag each tracker to a corner of the background element (in this example, the
corners of the picture frame).
4 Click the Analyze button in the HUD or Behaviors Inspector.
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