Apple Motion 5.1.1 - Manual (Page 355)

Chapter 9 Behaviors 355
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Object: An object well that defines the object of attraction. To set the defined target object,
drag the object from the Layers list to the Object well in the Attracted To HUD or Inspector. In
the Layers list, you can also drag the target object onto the Attracted To behavior.
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Strength: A slider defining the speed at which the object moves toward the object of
attraction. With a value of 0, the object doesn’t move at all. The higher the value, the faster the
object moves.
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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:
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Linear: Object attraction falls off in proportion to the object’s distance.
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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.
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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.
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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.
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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.
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Include X, Y, and Z: Buttons that specify the axes on which the affected object (or objects)
moves around the object to which it is attracted. When Z is enabled, the object moves about
its attractor object in Z space.
Attractor
The Attractor behavior, when applied to an object, causes other objects that lie within the area
of influence move toward it. You can manipulate the strength with which other objects are
attracted, as well as the distance required for attraction to begin.
Start of Attractor effect End of Attractor effect (motion paths shown)
By default, objects overshoot the object of attraction and bounce around, never coming to rest.
The Drag parameter lets you adjust this behavior, changing whether attracted objects overshoot
and bounce around, or whether they eventually slow down and stop at the position of the
target object.
The Attractor behavior can affect all objects in the Canvas that fall within the area of attraction,
or you can limit its effect to a specific list of objects by using the Affect parameter.
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