Attached Link: Cartesian to Polar Coordinates - Material Room

Oh yeah that's good pjz. I did that 5 -node trick for people unwilling to go the extra mile for realism and just want a quick fix.

I can do those radial fibers, no problem. Just have to use polar coordinates - very easy. If you want to race me, I'd love that.

The attached image is my brick shader which was designed for rectangular coordinates, tricked into making radial bricks by changing U and V into R and Theta.

Follow the link for a fascinating discussion of the use of polar coordinates and the importance of accuracy in the arctan function emulation. You need arctan to do polar and Poser math nodes don't have it. So I use an approximation. My buddy byRo used a different one. He thought his was good enough as his error was less than 1 part in a thousand. But that's not good enough.

Technical? You bet - dig in and you will be a node warrior too!

---

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)