Apple Motion 5.1.1 - Manual (Page 356)

Chapter 9 Behaviors 356
The Attractor behavior can also be applied to objects in motion. If you animate the position of
the target object to which you’ve applied the Attractor behavior, all other objects in the Canvas
continue to be attracted to its new position.
Parameters in the Inspector
•
Affect: A pop-up menu that limits which objects in your project are affected by the Attractor
behavior. There are three options:
•
All Objects: All objects in the Canvas are affected by the Attractor behavior.
•
Related Objects: The default setting. Only other objects in 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 list into this list to have the objects affected by this
behavior. To remove an item from the list, select the item and click Remove. The Affected
Objects list contains the following columns:
•
Layer: This column lists the name of the layer containing the object.
•
Name: This column lists the name of the object.
•
Strength: A slider that sets the speed at 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. There are two menu items:
•
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: A slider that sets 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 outside the area of
influence remain in place.
•
Drag: A slider that reduces 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 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.
Drag
The Drag behavior simulates the force of friction on a moving object, slowing it down over time.
Applying the Drag behavior is an easy way to decelerate objects with multiple behaviors that
create complex motion.
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