Apple Motion 4 - Manual (Page 465)

To remove a parameter from the Custom parameter list
µ
Choose the parameter you want to remove from the Remove Parameter list.
That parameter no longer appears in the Custom parameter list. Any keyframes that were
applied to that parameter are deleted.
Once you have animated all 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.
End Value: The value the Exponential behavior reaches at the last frame of the behavior.
Over the life of the behavior, the parameter the Exponential behavior is applied to makes
a transition from the Start Value to the End Value plus the original value.
465 Chapter 9 Using Behaviors