Apple Motion 3 - Manual (Page 481)

Chapter 5 Using Behaviors 481
HUD Control
The HUD has a pop-up menu that lets you limit the objects affected by this behavior, as
well as controls for Strength, Falloff Type, Falloff Rate, Influence, Drag, axis assignment,
and Direction.
Parameters in the Inspector
Affect: A pop-up menu that limits which objects in your project are affected by the
Vortex behavior. There are three options:
 All Objects: All objects in the Canvas are affected by the Vortex behavior.
 Related Objects: The default setting. Only other objects that are within the same
object as the object of attraction are affected.
 Specific Objects: Only objects appearing in the Affected Objects list are affected by
the Vortex behavior.
 Affected Objects: A list that appears when Specific Objects is chosen in the Affect
pop-up menu. Drag objects from the Layers tab into this list to be affected by the
Vortex behavior when the Specific Objects option is chosen in the Affect pop-up
menu. To remove an item from the list, select the item and click Remove.
Strength: A slider defining the speed at which the affected objects move about the
object of attraction.
Falloff Type: A pop-up menu that determines whether the distance defined by the
Influence parameter falls off linearly or exponentially. The default is Linear.
 Linear: Object attraction falls off in proportion to the object’s distance.
 Exponential: The closer an object is within the area of influence, the more strongly it
is attracted, and the faster it moves toward the object of attraction.
Falloff Rate: This value determines how quickly the force of attraction between objects
affected by this behavior falls off. A low Falloff Rate value results in objects quickly
getting up to speed as they move toward the object of attraction. A high Falloff Rate
causes objects to accelerate much more slowly. When set to Exponential, the attraction
falls off more quickly than when set to Linear.
Influence: A slider that defines the radius of the circle of influence, in pixels. Objects
that fall within the area of influence move toward the object of attraction. Objects that
are outside of the area of influence remain in place.
Drag: The default value for Vortex is 0, which results in a stable vortex. Any other value
causes the vortex to decay and the object to spiral into the object of attraction.
Include X, Y, and Z: Buttons that allow you to specify the space in which the objects
vortex around the target object. For example, when X and Y are enabled, the object
circles around in the XY plane; when Y and Z are enabled, the object circles around in
the YZ plane.