On Jul 9, 2012, at 5:19 PM, plussai wrote: > Next step for my project is to triangulate 'TrimLoop' which is a polygon > in uv region. I'v found a algorithm for the Triangulation. > Now,the question is in what form to represent the result of > triangulation?Is there a data structure for mesh that is implement in BRLCAD? > Opennurbs API has 'ON_Mesh' and 'ON_MeshFace' which may be useful.Can I > use them?
I'd avoid using ON_Mesh as that would introduce yet another meshing structure among three or four being used within BRL-CAD. Only if there was some strong compelling reason like it converting seamlessly and automatically with ON_Brep would it even be considered. You could just keep track of the triangulation using a vertex and face array (similar to what you'd do for OpenGL). That happens to be the same data structure used by our BoT primitive if you later need to put it into an "object" (see the mk_bot() routine for a helper function). You won't get explicit connectivity between faces, but it's simple and depending on what you're doing may be sufficient. Alternatively, the usual way for storing a generalized 3D mesh triangulation is to use our extensive nmg API. See any of the rt_*_tess() callback functions in LIBRT for examples on using that for stashing a tessellation (as that is exactly what those functions do). The rt_arb_tess() function is probably the simplest example. Cheers! Sean ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ BRL-CAD Developer mailing list brlcad-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/brlcad-devel
