[vtkusers] new vtkGLUTesselatorFilter

[Malcolm Drummond]

Hi

I've rewritten the wrapper class to the glu tesselator. As I've made some substantial changes I thought it best to rename it (now vtkGLUTesselatorFilter). It exploits the functionality of later versions of the GLU - all tesselator properties can now be set (Tolerance, WindingRule and BoundaryOnly) - so it's now possible to obtain unions, intersections etc. either as unfilled boundaries or as triangulations.

I'll expand the docs (non-existent at the moment) when the English part of my brain kicks in - for now it's best to consult the OpenGL programming guide to see what the tesselator is capable of. I've included some scripts to help get started.

Gurus, please add this code to the VTK library if it's of any use. 

Malcolm Drummond
GeoVision cc
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