On Wed, Jul 18, 2012 at 8:47 AM, phoenix <284281...@qq.com> wrote: > Hi, > > Today I find something interesting in proc-db/brepintersect.h(cpp). After > skimming the code I found it's doing something very similar to my current > surface-surface intersection. Is it an unfinished SSI implementation a few > years ago? I'm just very curious about this.
Ah, yeah that's right - that code is from an earlier GSoC attempt. Feel free to incorporate anything there you find useful, but I don't know how functional the various bits of that code are. I'm pretty sure that code doesn't have any logic using surface tree bounding boxes. By the way, there are line segment/line segment intersection routines in libbn that may be handy for this - see bn_isect_line3_line3. > Now I have added an option to the brep command in MGED and can tested > surface-surface intersection conveniently with it. The intersection function > still needs lots of improvements, though. I will upload some test results on > my log page in a few days. Excellent! Nice progress. Looking ahead a little bit (while I'm thinking about work already done) - once you are happy with the curves being produced by the intersection routine, the next step will be to "pull back" the 3D curve into the UV parameter spaces of the intersecting surfaces in order to create 2D trimming curves (and hence new trimmed surfaces that will be used to form the evaluated breps). There is logic for that task in the step-g converter - it needs to be moved into librt, but that will probably be a lot less work than re-creating it. Again, that's down the road after the intersection issue itself has been worked out, but I thought I'd mention it. Cliff ------------------------------------------------------------------------------ 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
