5

Table Of Contents
To constrain a handle’s angle to 45-degree increments
µ
While holding down the Shift key, drag the handle.
Extrapolation
In addition to setting interpolation for areas between keyframes, you can define how
Motion generates the values before the first keyframe and after the last one. This is known
as extrapolation. When you set a such a method for a parameter, keyframes are added
beyond your original keyframes, which is useful to extend the duration of an effect such
as a moving background. Several extrapolation methods are available Before First Keyframe
and After First Keyframe submenus in the Animation menu: Constant, Linear, Ping-Pong,
Repeat, and Progressive.
624 Chapter 12 Keyframes and Curves