Spring – Apple Motion 3 User Manual
Page 479
Chapter 5
Using Behaviors
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Include X, Y, and Z: Buttons that allow you to specify the space in which the object
moves away from the selected object. For example, when X and Y are enabled, the
object moves in the XY plane; when Y and Z are enabled, the object moves in the YZ
plane.
Related Behaviors
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Rotational Drag
This behavior 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.
HUD Control
The HUD lets you control the amount of drag. When applied to an object that contains
multiple objects (such as a group, particles, text, or the replicator), the Affect
Subobjects checkbox also appears in the HUD.
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 turned on, all objects within the parent object are affected
individually. When this checkbox is turned off, all objects within the parent object are
affected by the behavior together, as if they were a single object.
Amount: A slider that can be 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.
Related Behaviors
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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 will be much more complex, changing direction according to
the velocity of the Attract To object.