very nice.
I did some thread iso's a while ago. :-)
http://news.povray.org/povray.binaries.images/thread/%3Cweb.4139722b2521c5a8399d8d0%40news.povray.org%3E/?mtop=8
the problem i had is that they don't look very good because the threads
don't have a rounded edge, so there is no highlight.
