Apple Motion 4 - Manual (Page 410)

Applying Parameter Behaviors
Parameter behaviors function differently than other behaviors. All behaviors affect specific
parameters of an object—when a Spin behavior is applied to an image, the Rotation
parameter for that image is automatically affected; when a Fade In/Fade Out behavior is
applied to a clip, the Opacity parameter for that clip is automatically affected, and so on.
Parameter behaviors are applied to individual parameters of an object, camera, filter,
behavior, and so on, rather than to the object itself.
This includes the parameters of filters, emitters and cells in particle systems, shapes, text,
and so on. You can also apply Parameter behaviors to the parameters of other behaviors
that have been applied to an object.
In a simple comparison, a Throw behavior is applied to a text layer and the text travels
across the Canvas. The Throw behavior affects the Position parameter of the text layer.
If an Oscillate Parameter behavior is applied directly to the Position parameter of a shape,
that shape moves back and forth across the Canvas.
A Parameter behavior’s effect on an object depends on the parameter to which it is
applied. For example, if you apply the Randomize parameter behavior to a particle emitter’s
Position parameter, the emitter drifts around the screen when the project plays. Applying
the Randomize parameter behavior to a shape’s Scale parameter makes the shape
randomly grow and shrink.
Important: Although you can apply a Parameter behavior to an object using Library
behavior or the Add Behavior icon in the Toolbar, the applied behavior will not affect the
object until you select a parameter to which you want to apply the Parameter behavior.
A more direct way to apply a Parameter behavior is by using the shortcut menu in the
Inspector.
To apply a Parameter behavior to a specific parameter of an object
1 Select the object to which you want to apply the Parameter behavior.
410 Chapter 9 Using Behaviors