Motion 5 - Attracted To

The Drag parameter lets you define whether attracted objects overshoot and bounce
about the attracting object, or whether they eventually slow down and stop at the position
of the target object.

You can apply two or more Attracted To behaviors to a single object, each with a different
object of attraction, to create tug-of-war situations where the object bounces among all
objects it’s attracted to.

Parameters in the Inspector

Affect Subobjects:

This parameter appears when this behavior is applied to an object

that contains multiple objects, such as a group, a particle emitter, a replicator, or a text
layer. When this checkbox is selected, all objects in the parent object are affected
individually. When this checkbox is deselected, all objects in the parent object are affected
by the behavior together.

Object:

An image 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.

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.

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 outside
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.

453

Chapter 9

Using Behaviors