Animating a Tilted Rotation

[csm]

I am trying to set my keys for a sphere that has a fixed-23 degree tilt (rotation) on the X axis. I then want to animated the rotation of this sphere around the Y axis in such a manner that the rotation remains perpendicular to this -23 degree tilt on the X axis through out. However, ever time I try to key a 360 degree rotation around a Y axis that is tilted -23 degrees on X , the Y axis rotation snaps back to a 0 degrees tilt on X so that the sphere appears to wobble instead of rotating on a "local" Y axis at a -23 degrees tilt. Any help around this would be greatly appreciated.

[tbriggs]

Rotate the object on its y axis only. Then group it to itself and put the 23 degree tilt on the parent ( group ) node.

/*In theory there is no difference between theory and practice
In practice they are very different*/

[warpcat]

What should work would be to change the roate order of the sphere (in the attribute editor) from the default XYZ to ZYX or YZX. This will make the X gimbal plane the parent of the rotate hierarchy, thus modifying the gimbal planes of Y and Z. This "should" give you what you want. By "tilting" the sphere on X, it should "tilt" the rotate gimbal planes of the Y and Z axes as well, making the Y rotation perpendicular to X. With the default rotate order of XYZ, X is the child of the gimbal hierarchy, so it's rotations don't effect the orientation of the other gimbal planes. Even though you've tilted your planet on X, the Y gimbal plane hasn't been modified, and the Y rotation wouldn't appear correct in this circumstance.

[pbuckley]

Thanks warpcat for that handy little piece of info.