[vtkusers] Rotating vtkTransform around specific point and axis?

[Aroosha Laghaee]

Hello,

Could anyone please tell me how I could go about rotating a vtkTransform around
a single axis (e.g. the Z axis) originated around a specific point in space
(x,y,z)? I would like to do a similar thing to setting the origin of an actor
and then rotating it around one of the three axis. I must use a transform
filter and transform as I need to keep track of the updated position of my
actors and the vtkActor methods only affect the rendered objects and not the
actual point coordinates.

I'd be grate ful for any help or suggestion.

Many thanks,
        Aroosha