[vtkusers] Rotation about axes

[Geoffrey Dix]

Hello,

I am trying to rotate an actor about an axis and at the same time have the
output of a vtkDataSetWriter object change.  I am able to use RotateX, RotateY,
and RotateZ, but this does not change vtkDataSetWriter's output.  Also, I was
wondering how to keep the axis stationary while using the mouse to rotate an
actor (right now I am using buttons to rotate the actor).  Thank you in advance
for any suggestions.

Geoff