5

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 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 apply specific values 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, might 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.
368 Chapter 9 Using Behaviors