[vtkusers] VTK Contouring, combining perpendicular polygons

[HarryG]

I have implemented a feasible but probably suboptimal solution:
I ended up flipping the axes of the sagittal and coronal plane contours to
give them constant Z values, then I extruded and stenciled that flipped
data, then I was able to manually flip the axes of the stencil back to the
original orientation to be merged with the other axes.

This whole process has felt pretty ridiculous, so I would love to hear if
there is an easier way to do it, but this way works for now. 
Feel free to email if you have any questions on the details of my solution,
and I can post the actual code here when it becomes open source in the
coming months. 

Thanks,
Harry



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