Apple Motion 4 - Manual (Page 309)

Using the Adjust Four Corner Tool
The Adjust Four Corner tool activates onscreen controls that allow you to stretch an object
into different polygonal shapes to create false perspective effects and simulate 3D effects
and placement within your composition.
Before corner-pinning After corner-pinning
To corner-pin an object in the Canvas
1 Click and hold the Select/Transform tool, then choose the Adjust Four Corner tool from
the pop-up menu.
2 In the Canvas, drag each of the four corner handles to stretch the object into the shape
you want.
Note: Just as you can with the scale handles, you can reverse the corner handles to flip
the image. However, changing the angle of any one corner more than 180 degrees can
produce unexpected results.
After you have corner-pinned an object, you can quickly revert back to the object’s original
shape by deselecting the object’s Four Corner checkbox in the Properties tab of the
Inspector. Doing so resets the shape of the object without resetting the corner-pinning
shape you defined in the Four Corner parameter of the Properties tab.
Note: The Four Corner parameter can be used in combination with a tracking behavior
to create a four-corner track on a foreground object. For more information, see
Option
2: Corner-Pin the Object Before Tracking .
309 Chapter 7 Basic Compositing