Motion 5 - Vortex

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The opposite of the Orbit Around behavior. Whereas the Orbit Around behavior causes
one object to orbit around another target object, the Vortex behavior exerts a force on
all objects surrounding the object to which the Vortex behavior is applied.

Parameters in the Inspector


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 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

Vortex 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 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.


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.


Chapter 9

Using Behaviors

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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.

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.


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.


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

Pole Axis:

This parameter 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

Orbit Around



A pop-up menu that lets you set whether objects move around in a clockwise

or counterclockwise direction.

HUD Controls
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.

Related Behaviors

Attracted To


Drift Attracted To

Drift Attractor

Orbit Around



Chapter 9

Using Behaviors