Apple Motion 5.1.1 - Manual (Page 366)

Chapter 9 Behaviors 366
Rotational Drag
Rotational Drag is similar to the Drag behavior, except that it affects Rotation instead of position.
Rotational Drag simulates friction affecting objects that are spinning due to keyframed or
behavior-driven changes to the Rotation parameter. By setting higher Drag values, you can slow
rotational changes to an eventual stop.
Parameters in the Inspector
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Affect Subobjects: A checkbox that 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.
•
Amount: A slider used to slow down an object’s rotation over time, causing it to eventually
come to a stop. Higher Amount values result in the rotation ending sooner.
Spring
The Spring behavior creates a relationship between two objects, so that an object with the
Spring behavior applied to it moves back and forth around a second object. The Attract To
parameter defines the object that serves as the target and center of the Spring behavior.
Additional parameters let you adjust the speed of the behavior (Spring Tension) and the
acceleration of the object at each change in direction (Relaxed Length).
If the Attract To object is at rest, 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 is much more complex, changing direction according to the velocity of the Attract
To object.
Parameters in the Inspector
•
Affect Subobjects: A checkbox that 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.
•
Attract To: An object well that defines the object of attraction. To set the defined target object,
drag the object from the Layers list to the Attract To well in the Spring HUD or Inspector. In the
Layers list, 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: A slider that sets the distance from the target object where 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: A checkbox that, when selected, pushes objects apart as the target object gets closer to
the object of attraction than the Relaxed Length value. When this checkbox is deselected, no
repelling force is applied.
•
Include X, Y, and Z: Buttons that specify the space in which the affected object moves back and
forth around the assigned object. For example, when X and Y are enabled, the object moves
back and forth in the XY plane; when Y and Z are enabled, the object moves back and forth in
the YZ plane.
Vortex
The opposite of the Orbit Around behavior, the Vortex behavior exerts a force on all objects
surrounding the object to which the Vortex behavior is applied.
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