Apple Motion 5.1.1 User Manual
Page 367
Chapter 9
Behaviors
367
Parameters in the Inspector
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Affect: A pop-up menu that limits which objects in your project are affected by the Vortex
behavior. There are three options:
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All Objects: All objects in the Canvas are affected by the Vortex behavior.
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Related Objects: The default setting. Only other objects in the same group as the object of
attraction are affected.
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Specific Objects: Only objects appearing in the Affected Objects list are affected by the
Vortex behavior.
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Affected Objects: A list that appears when Specific Objects is chosen in the Affect pop-up
menu. Objects you drag from the Layers list into this list are 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. The Affected Objects lists contains the
following columns:
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Layer: This column lists the name of the layer containing the object.
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Name: This column lists the name of the object.
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Strength: A slider that sets the speed at which the affected objects move about the object
of attraction.
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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. The default is Linear.
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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 causes the vortex to decay. 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.
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Include X, Y, and Z: Buttons that 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.
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Pole Axis: A pop-up menu that becomes available when the X, Y, and Z axes are enabled in the
Include parameter. Because all points are at a fixed distance from the target or attractor object
(the Pole Axis), the object can be visualized on a sphere of all possible orbits, with the target
object at the center of the sphere. The Pole Axis defines the two points on the sphere that
the orbit must pass through. For more information, see this parameter’s discussion in
on page 360.
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Direction: A pop-up menu that sets whether objects move around in a clockwise or
counterclockwise direction.
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