Apple Motion 5.1.1 - Manual (Page 311)

Chapter 9 Behaviors 311
However, if you apply the Randomize parameter behavior to the same object, its effect combines
with the motion path you created. As a result, the animation path follows the general direction
you want, with random variation in it to make it interesting.
Although this example shows how you can combine behaviors and keyframes to create
animation paths, you can combine behaviors and keyframes for any parameter.
Behaviors and keyframes in the Keyframe Editor
When you display a parameter that’s affected by a behavior in the Keyframe Editor, two curves
appear for that parameter. A noneditable curve in the background displays the parameter as it
is affected by the behavior. There are no keyframes over this first curve. Superimposed over the
curve displaying the behavior’s effect is the parameter’s editable curve.
You can keyframe a parameter before or after applying a behavior to the object that affects it.
When you keyframe a parameter already affected by a behavior, the value of the keyframed
curve is combined with the value generated by the behavior at each frame, which raises or
lowers the resulting value displayed by the background curve. The background curve doesn’t just
display the behavior’s animated values, it displays the sum of all values affecting that parameter.
Behavior effect curve Editable curve
Raising or lowering a keyframe in the Keyframe Editor also raises or lowers the background
curve, because the keyframe is modifying the values generated by the behavior.
Important: The value displayed in the Inspector for the affected parameter reflects the combined
result of keyframes and behaviors applied to that parameter. Editing a parameter’s values in the
Inspector only results in changes made to the underlying parameter value, whether keyframed or
not. This parameter value is then combined with the behavior’s effect, yielding a final value that
might differ from the value you entered.
For more information on how to use keyframes in the Keyframe Editor, see Keyframing
overview on page 439.
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