: I found this include file that may be of interest:
: http://news.povray.org/Xns940C86DC9B1D4None%40204.213.191.226
An error in that include file was corrected later:
http://news.povray.org/povray.binaries.scene-files/thread/%3CXns940E6C1F42D3FNone%40204.213.191.226%3E/?ttop=227233&toff=250
