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Behaviors can also be used to animate the parameters of nearly any particle system
emitter, shape, mask, replicator, filter, generator, camera, or light. This allows you to create
animated backgrounds, dynamic filter effects, interesting camera and lighting effects,
and incredibly complex particle systems, all using a few simple controls.
Motion Tracking behaviors serve a different purpose than other behaviors. Rather than
immediately animating an object to which it is applied, a tracking behavior analyzes the
object’s motion, or the motion in a video clip. This analyzed motion can be used to stabilize
a shaky clip, or match the movement of an object to the movement in the analyzed clip.
For more information, see Motion Tracking.
There are 11 kinds of behaviors in Motion.
• Audio behaviors are applied to audio files to create simple audio effects, such as fade-ins
and fade-outs, pans, and fly-bys. There is also a separate Audio parameter behavior
that can be applied to the parameters of nearly any object. For more information, see
Audio Behaviors.
• Basic Motion behaviors are among the simplest behaviors. They animate specific
parameters of the object to which they are applied. Some Basic Motion behaviors affect
position while others affect scale or rotation. Examples include Fade In/Fade Out, Spin,
and Throw. All Basic Motion behaviors can be applied to images and clips, particle
emitters, shapes, text, and so on. Most of the Basic Motion behaviors can be applied
to cameras and lights. For more information, see Basic Motion Behaviors
• Camera behaviors are specifically designed to be applied to a camera in a 3D project
and create basic camera motions such as dolly moves, panning, and zooming. For more
information, see Camera Behaviors.
• Motion Tracking behaviors perform multiple tasks. Although all tracking behaviors
analyze the motion present in a clip, the application of that data varies depending on
the specific behavior. For example, the Stabilize behavior stabilizes movement in a clip
created by camera shake. The Match Move behavior analyzes the motion in an object
(such as a clip) and applies that motion to another object to integrate it with the tracking
source. For more information, see Motion Tracking Behaviors.
• A Parameter behavior can be applied to a specific parameter of any object (including
filters and behaviors) and the effect is limited to just that parameter. The same Parameter
behavior can be applied to different parameters, resulting in different effects. For
example, you can apply the Oscillate behavior to the opacity of text to make the letters
fade in and out, or you can apply the Oscillate behavior to the rotation of a shape to
make the shape rock back and forth. You can also apply Parameter behaviors to filter
parameters, generator parameters, the parameters of particle systems and replicators,
or even the parameters of other behaviors. Examples include Oscillate, Randomize, and
Reverse. Most Parameter behaviors can be applied to cameras and lights. For more
information, see Parameter Behaviors.
366 Chapter 9 Using Behaviors