A similar bug in tgc: http://sourceforge.net/p/brlcad/bugs/288/
Ouch, I hadn't seen that one in action. Confirmed that it gives bad results for pretty much any elevation near-zero. I think it's a very different issue from the ehy problem, but still a rather serious unexpected one.
This would make for a fantastic bug for any GSoC applicant to look into for a patch:
1) Download/install BRL-CAD, run mged on the provided share/db/havoc.g model
2) Within mged, "draw s.tail41.i" and "ae 300 0" and "rt" -- see the bad results
3) Find and fix the bug probably in rt_tgc_shot() in src/librt/primitives/tgc/tgc.c
Cheers!
Sean
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