Apple Motion 2 - Manual (Page 369)

Chapter 5 Using Behaviors 369
Simulation Behaviors
These behaviors perform one of two tasks. Some Simulation behaviors, such as Gravity,
animate the parameters of an object in a way that simulates a real-world phenomenon.
Other Simulation behaviors, such as Attractor and Repel, affect the parameters of one
or more objects surrounding the object to which they’re applied. These behaviors allow
you to create some very sophisticated interactions among multiple objects in your
project with a minimum of adjustments. Like the Basic Motion behaviors, Simulation
behaviors also affect specific object parameters. Examples include Attractor, Gravity,
and Repel.
Important: Several Simulation behavior parameters contain object wells into which
target objects used as attractors, repellers, orbiters, and so on, are dragged. Dragging
an object to a well may be tricky—be sure to click the object name in the Layers tab
and immediately drag the object to the object well (without releasing the mouse
button). The behavior must remain active even though you are clicking another object
in the Layers tab. If you click the object in the Layers tab and release the mouse button,
that object is now selected, and the behavior’s parameters are no longer displayed. This
behavior is true of all wells, including mask source and image wells.
Align To Motion
The Align To Motion behavior changes the rotation of an object to match changes
made to its direction along an animation path. This behavior is meant to be combined
with behaviors that animate the position of an object, or with a keyframed animation
path you create yourself.
Examples of Using Simulation Behaviors
To view examples of working with the different Simulation behaviors, see “Working
With Simulation Behaviors” in the “The Playground” section of the Motion Getting
Started book.
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