Apple Motion 4 - Manual (Page 402)

Behaviors Versus Keyframes
It’s important to understand that behaviors do not add keyframes to the objects or
parameters to which they’re applied. Instead, behaviors automatically generate a range
of values that are then applied to an object’s parameters, animating over the duration
of the behavior. Changing the parameters of a behavior alters the range of values that
behavior generates.
Keyframes, on the other hand, apply specific values directly to a parameter. When you
apply two or more keyframes with different values to a parameter, you animate that
parameter from the first keyframed value to the last.
By design, behaviors are most useful for creating generalized, ongoing motion effects.
They’re also extremely useful for creating animated effects that might be too complex
or time-consuming to keyframe manually. Keyframing, in turn, may be more useful for
creating specific animated effects where the parameter you’re adjusting is required to
hit a specific value at a specific time. For more information on using keyframes, see
Keyframes and Curves .
The animation created by behaviors can be converted into keyframes. For more
information, see
Converting Behaviors to Keyframes .
402 Chapter 9 Using Behaviors