Apple Motion 2 User Manual

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Chapter 5

Using Behaviors

If the Attract To object is at a stop, the resulting motion is fairly simple and the
springing object moves back and forth in a straight line. If the Attract To object is in
motion, the springing object’s motion will be much more complex, changing direction
according to the velocity of the Attract To object.

Dashboard control
An image well in the Dashboard lets you set the Attract To object. Two sliders let you
adjust the Spring Tension and Relaxed Length of the Spring effect. A checkbox lets you
turn on the Repel parameter. When applied to a layer or group (such as particles text,
or the replicator), the Affect Objects checkbox also appears in the Dashboard.

Parameters in the Inspector

Affect Objects: This parameter appears when this behavior is applied to an object that
contains multiple objects, such as a layer, particle emitter, replicator, or text object.
When this checkbox is turned on, all objects within the parent object are affected
individually. When this checkbox is turned off, all objects within the layer are affected
by the behavior together, as if they were a single object.

Attract To: An image well that defines the object of attraction. To set the defined
target object, drag the object from the Layers tab to the Object well in the Spring
Dashboard or Inspector. In the Layers tab, you can also drag the target object onto the
Spring behavior.

Spring Tension: A slider that determines how fast the object is pulled toward the
object of attraction.

Relaxed Length: The distance from the target object at which object attraction
diminishes to zero. As the springing object’s distance increases past this point, the force
of attraction increases proportionally, to bring it back toward the target object.

Repel: With this checkbox turned on, when the object gets closer to the object of
attraction than the Relaxed Length value, the objects are pushed apart. When this
checkbox is turned off, no repelling force is applied.

Related behaviors
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