The concave/convex detector (if I can get it to work) would be an excellent use case for the new compound nodes in Poser. I could give you what looks like a single new node that does the work for you, while inside the 50 (or however many) nodes remain hiding, leaving users blissfully free to deal with application, not implementation.

---

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)