What does BRL-CAD do in terms of NPR rendering? I'm not thinking particularly artistic forms of NPR, but mainly extracting feature lines on the fly.
In OpenVSP, I have a few heuristics that create a few feature lines, but there are others that we don't generate -- and some that are there don't really add much to the view. I've read a bunch of papers about purely OpenGL based approaches -- while fast, those don't let you 'keep' the lines for output to a drawing (vector file) or whatnot. All this made me wonder what BRL-CAD does in this area. Best, Rob
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