Apple Motion 3 - Manual (Page 432)

432 Chapter 5 Using Behaviors
Clamp
This behavior allows you to define a minimum and maximum value for an animated
parameter. In the following illustration, the center image has an applied Vortex
behavior. The outer images circle around the center image, as indicated by the red
animation path.
In the next illustration, a Clamp behavior is applied to the X Position parameter of the
upper image. The Max value is set to 230 and the Min value is set to 0.
Notice that the circle motion path is essentially cut in half. If a negative value is entered
in the Min value field, the image moves past the 0 point.
HUD Control
The HUD lets you set the clamp to Min, Max, or Min and Max values, and also to
change the parameter assignment.
The red lines indicate the animation paths of
the outer image.
The animation path of the upper image shows
that the image travels 230 pixels to the right but
does not move left past the 0 point. This creates
a half-circle animation.