5

After you add the parameters to animate in your Custom behavior, you can keyframe
them in the Keyframe Editor to create whatever animated effect you require. For more
information on keyframing parameters to create animation, see Animating Behaviors.
To remove a parameter from the Custom parameter list
µ
Choose the parameter to remove from the Remove Parameter list.
That parameter no longer appears in the Custom parameter list. Any keyframes applied
to that parameter are deleted.
After you animate the parameters you added, you can save the Custom behavior into
the Library for future use. For more information about saving Custom behaviors to the
Library, see Saving and Sharing Custom Behaviors.
When you apply a Custom behavior that you’ve saved in the Library to an object in a
project, its keyframed animation is scaled to the duration of the object to which it is
applied. This means that no matter how long the original Custom behavior was, you can
apply it to any object, and the animated effect speeds up or slows down to accommodate
the new object’s duration.
Exponential
The Exponential parameter behavior creates more natural animations when scaling
objects, especially when using high values. For example, when an object scales from very
small to very large, the animation appears to slow down as the object reaches its upper
scale values. The Exponential parameter behavior works like the Ramp behavior, but
applies a mathematical function to create an exponential curve (rather than linear)
between the two values. This allows the animation to progress slowly when the scale
values are small and speed up when the scale values are large.
Tip: When applied to parameters other than Scale, the Exponential parameter behavior
creates more organic animations than other interpolation modes.
You can also change the interpolation modes of keyframes to Exponential. For more
information, see Modifying Curves.
Parameters in the Inspector
Start Value: The value that’s added to the parameter at the first frame of the Exponential
behavior.
426 Chapter 9 Using Behaviors