[vtkusers] Stl file import and Visible Polygons

[timtitan]

Hello

I am looking for advice on VTK, I need to import stl files and then for a
given set of spherical coordinates get a list of all visible triangles of a
subset of the imported files. I can then use the vertices and normals of
the triangles for aperture processing, but while I have no problem with
importing stl files and rendering them, I don't have a fast way of
isolating the visible triangles for a given angle. I read the example on
the wiki, and was wondering if you could give me your advice. I don't want
to display it each time, as I need to extract the cell id list of visible
triangles for a large set of spherical coordinates.

I can then use the cell ids to pass the polygons to my function for
processing for area, orientation and other things.

Many Thanks for your time

Tim
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