[vtkusers] Changing the direction of Z

[Paul Harris]

Hi all,

I have a VTK scene with some vtkPolyDataMappers and actors, plus an
orientation widget.

I want to change the fundamental direction of the Z axis, so that it points
down rather than up.  I want all of the models, the orientation widget, etc
to flip, so that they point down instead of up.

I've tried lots of things but have gotten nowhere...

how do I make this happen?

thanks
Paul
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