Apple Motion 4 - Manual (Page 425)

Trimming the Out point of a behavior often sets the object to its original state beyond
the Out point behavior. For many behaviors, using the Stop behavior to pause the object’s
animation is a more efficient method than trimming its Out point. Another way to stop
a behavior’s effect and leave the affected object in the transformed state is to adjust a
behavior’s Start and End Offset parameters. See
Changing the Offset of Parameter
Behaviors for more information.
Note: The Simulation behaviors do not leave the object at the transformed state after
the last frame of the trimmed behavior. For more information, see
Controlling Simulation
Behaviors .
Controlling Simulation Behaviors
Keep in mind that the ideal use for behaviors (with the exception of the Motion Tracking
behaviors) is creating fluid motion graphics that do not require specific timing. This is
especially true with the Simulation behavior group, which allows you to create some very
sophisticated interactions among multiple objects in your project with minimal editing.
Unlike Basic Motion behaviors, you cannot stop or change the motion of a Simulation
behavior in the Timeline. However, you can affect the rate of a Simulation behavior by
modifying its duration in the Timeline. You can also change the starting frame of the
behavior.
But because the Simulation behaviors simulate natural effects, such as Gravity, the laws
of inertia apply—an external force set the object in motion, and that object stays in
motion even once the active force is no longer present. Changing the duration of a
Timeline bar for a Simulation behavior does stop the “active” force on the object, but
does not stop the motion of the object. You can, of course, control Simulation behaviors
by modifying their parameters.
In the following image, the Orbit Around (Simulation) behavior is applied to the large
circle. The center text is assigned as the object that the circle moves around. The red
animation path represents the motion the circle travels over its duration. The Orbit Around
behavior is the same duration (300 frames) as the large circle to which it is applied.
Animation path
Behavior and object are
the same duration
425 Chapter 9 Using Behaviors