Rob, BRL-CAD includes an application called “rtedge” that produces rasterized hidden line edge drawings. These can be useful standalone as a foundation for diagrams and blueprinting, or they can be overlaid over shaded renderings. Here are a couple examples:
https://www.facebook.com/brlcad/photos/10155080800198873/ <https://www.facebook.com/brlcad/photos/10155080800198873/> https://brlcad.org/gallery/galleries/renderings/bradley_rtwizard.jpg There are related tools and features for other styles, such a generating a silhouette projection or generating flat-shaded rendering, plus a suite of tools that will post-process in image space (e.g., to quantize colors or color replacements and much more). Cheers! Sean > On Mar 8, 2021, at 8:21 PM, Rob McDonald <[email protected]> wrote: > > 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 > _______________________________________________ > BRL-CAD Developer mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/brlcad-devel
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