Apple Motion 3 - Manual (Page 480)

480 Chapter 5 Using Behaviors
HUD Control
An image well in the HUD lets you set the Attract To object. You can also control the
Spring Tension and Relaxed Length parameters and axis assignment. A checkbox lets
you turn on the Repel parameter. When this behavior is 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.
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 Attract To well in the Spring
HUD 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.
Include X, Y, and Z: Buttons that allow you to 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.
Related Behaviors
“
Attracted To ,” “ Attractor ,” “ Drift Attracted To ,” “ Drift Attractor ,” “ Orbit Around ,” “ Vortex ”
Vortex
The opposite of the Orbit Around behavior. While 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.