Apple Motion 4 - Manual (Page 500)

• Related Objects: The default setting. Only other objects that are within the same group
as the object of attraction are affected.
• Specific Objects: Only objects appearing in the Affected Objects list are affected by the
Attractor 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 Attractor
behavior when the Specific Objects option is selected in the Affect pop-up menu. To
remove an item from the list, select the item and click Remove.
• Layer: This column lists the name of the layer containing the object.
• Name: This column lists the name of the object itself.
Strength: A slider defining the speed with which attracted objects move toward the
target object. With a value of 0, attracted objects don’t move at all. The higher the value,
the faster attracted objects move.
Falloff Type: A pop-up menu that determines whether the distance defined by the
Influence parameter falls off linearly or exponentially.
• 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: A slider that can be used to reduce the distance attracted objects overshoot the
object of attraction. Lower Drag values result in the object overshooting the object of
attraction, moving past and then careening back around toward the target object again
and again. Higher Drag values result in the object coming to rest sooner.
Include X, Y, and Z: Buttons that allow you to specify the space in which the object (or
objects) moves toward the target object. For example, when X and Y are enabled, the
object moves in the XY plane; when Y and Z are enabled, the object moves in the YZ
plane.
HUD Controls
The HUD lets you adjust the Affect, Strength, Falloff Type, Falloff Rate, Influence, Drag,
and axis assignment parameters.
500 Chapter 9 Using Behaviors