9

Use Center Flyout 445
rotation axes are not necessarily orthogonal to
each other.
WhenyourotateaboutasingleaxiswiththeLocal
and Parent coordinate systems, this can change
twoorthreeoftheEulerXYZtracks.TheGimbal
coordinate system avoids this problem: Euler XYZ
rotation about one axis changes only that axis’s
track. This makes function curve editing easier.
Also, absolute transform t ype-in w ith Gimbal
coordinates uses the same Euler a ngle values as
the animation tracks (as opposed to Euler angles
relative to the World or Parent coordinate system,
as those coordinate systems require).
For move and scale transforms, Gimbal
coordinatesarethesameasParentcoordinates.
When the object does not have an Euler XYZ
Rotation controller assigned, Gimbal rotation is
the same as Parent rotation.
The Euler XYZ controller can be the active
controller in a List controller, too.
Grid—Uses the coordinate system of the active
grid.
Using an active grid coordinate system.
Pick —Usesthecoordinatesystemofanotherobject
in the scene.
After you choose Pick, click to select the single
objectwhosecoordinatesystemthetransforms
willuse. Theobject’snameappearsinthe
Transfor m Coordinate System list.
Becausethesoftwaresavesanobject’snameinthe
list, you can pick an object’s co ordinate system,
changetheactivecoordinatesystem,andthen
use the object’s coordinate system again at a later
time. The list saves the four most recently picked
object names.
When using Pick to specify an object as a reference
coordinate system, you can press
H to display
the Select Objects dialog (page 1–78) and pick the
object from there.
YoucanpickobjectswithinanXRefsceneas
coordinate reference system.
Using another object as the coordinate system
Use Center Fly out
Main toolb a r > Use Center flyout