Apple Motion 2 - Manual (Page 834)

834 Chapter 12 Using Shapes and Masks
Important: If automatic keyframing is enabled, curve adjustments are keyframed,
creating animated shape changes.
Editing B-Spline Control Points
Editing the position of control points in B-Spline shapes is similar to editing Bezier
shapes. In fact, the steps for selecting, moving, adding, deleting, and locking control
points are almost exactly the same. The main difference in editing both types of shapes
lies in how you manipulate and adjust curves.
The simplest, and usually fastest, way to manipulate B-Spline curves is to move one or
more B-Spline points closer to or farther away from one another. When B-Spline points
are moved closer to one another, a sharper curve is created. B-Spline points that are
farther away from one another create shallower curves.
Each B-Spline control point tugs on a section of the shape, pulling it toward itself. As a
result, you manipulate a shape’s curve by moving its control points in the direction you
want to pull the shape. For example, notice how every control point creating the S
curve below is offset in the direction of the curve it influences.
Note: You can show and hide the B-Spline frame lines that enclose B-Spline control
points by choosing View > Overlays > Lines.
Shallow curve Sharper curve. B-Spline
points are closer.
01112.book Page 834 Sunday, March 13, 2005 10:36 PM