Apple Motion 3 - Manual (Page 416)

416 Chapter 5 Using Behaviors
 Damping: A slider that progressively diminishes the oscillation of the wave.
Positive damping values diminish the wave forward (from left to right); negative
values diminish the wave backward (from right to left).
 Geometry: The object travels along the edge of a shape or mask that is used as the
source for the path.
Wave shape Damping value set to 0 Damping value set to 3
Damping value set to –3
The motion path defined in the Shape Source
image well Shape layer used as the Shape Source