[vtkusers] Elliptical Cylinder Cutter

[Ryan Irvin]

I've got a model setup where I use a vtkCylinder as a cutter on the output
of a vtkContourFilter to form a surface with a circular aperture.  I would
like to extend the aperture shape to be generally elliptical rather than
just circular.  Can anyone recommend an efficient way of setting this up?

Thanks,
Ryan
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