Apple Motion 3 - Manual (Page 387)

Chapter 5 Using Behaviors 387
2 In the Behaviors tab in the Inspector, choose a new parameter from the Apply To (“Go”)
pop-up menu.
The Track Parameter Behavior
The Track Parameter behavior allows you to track a parameter of an effect, such as the
center of a lens flare, to a reference point on a clip. For example, you can make a light
ray emit from a moving object in a clip by tracking the clip and then applying the Track
Parameter behavior to the Center parameter of the Light Rays filter. For more
information about using the Track Parameter behavior, see “
Motion Tracking ” in the
Motion Supplemental Documentation PDF.
Modifying Behaviors
Each behavior has a subset (or sometimes a complete set) of parameters that appear in
the HUD. In addition, all behavior parameters appear in the Behaviors tab of the
Inspector. Both the HUD and the Behaviors tab reference the same parameters, so
changing a parameter in one automatically changes the same parameter in the other.