[vtkusers] outline of a mesh

[Terry Hastings]

Hello

originally I was using a vtkUnstructuredGrid to represent my mesh which 
worked fine, but it was rendering too slow for my purpose

So now i've decided to use the wall node and wall element information to get 
an outline of the mesh

Originally the unstructured grid consisted of a bunch of vtkTetra cells 
(each with 4 nodes), but now since i'm just outlining the wall, i have a 
bunch of triangular 'faces'

I tried using vtkUnstructuredGrid consisting of vtkTriangle cells but it 
crashes when I render - I reviewed my code and cant find what could be teh 
problem, so this leads me to ask if vtkUnstructuredGrid is a suitable class 
to represent this 'outline' of a mesh?

thanks
terry

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