Apple Motion 4 - Manual (Page 455)

Spin
Apply the Spin behavior to animate the rotation of an object, spinning it around a single
axis. Using the Custom axis controls, the rotation does not have to occur on a principle
axis (X, Y, or Z). If you trim the end of the Spin behavior to be shorter than the duration
of the object to which it is applied, it remains at the angle of the last frame of the behavior,
as long as there are no other behaviors or keyframes affecting that object’s Rotation
parameter.
Uses for Spin are fairly obvious, but another way to use the Spin behavior is with objects
that have an off-center anchor point. Because objects rotate around the anchor point, if
you change an object’s anchor point before you apply a Spin behavior to it, you can
quickly change the look of the motion you create. For more information on changing an
object’s anchor point, see
Using the Adjust Anchor Point Tool .
Note: Although the Spin behavior appears in the Basic Motion category, Spin is treated
as a Simulation behavior in Motion’s order of operations. For more information, see
Behavior Order of Operations .
Parameters in the Inspector
Affect Subobjects: This parameter appears when Spin is applied to an object that contains
multiple objects, such as a group, particle emitter, or text. When this checkbox is selected,
each object within the layer or group rotates as an individual object. When this checkbox
is deselected, the entire layer or group spins.
Increment: This pop-up menu lets you choose how the behavior’s effect progresses over
its duration in the Timeline. There are two choices:
• Continuous Rate: Uses the Spin Rate parameter to spin the object by a steady number
of degrees per second.
• Ramp to Final Value: Spins the object for the number of degrees specified in the Spin
To parameter over the behavior’s duration in the Timeline.
Spin Rate/Spin To: A dial controlling the speed at which the object spins. When Increment
is set to Continuous Rate, the Spin Rate defines a continuous rate of spin in degrees per
second. When Increment is set to Ramp to Final Value, Spin To defines a number of
degrees to spin over that object’s duration. Negative values result in clockwise motion,
while positive values result in counterclockwise motion.
455 Chapter 9 Using Behaviors