Hi, yep, I totally agree about the average-render-time for most volumetrics, because I "only" own a P-II-450! ;-) My text-file, which I provided with my BR4-scenes included the url for the "Tagliatelle-tutorial" by Jonathan Allen, which I can recommend. Here it is: http://easyweb.easynet.co.uk/~jba/bigsite/tagtut1.html Cheers, Hubert

"All that we see or fear, is but a Sphere inside a Sphere."     (E. A. Pryce -- Tuesday afternoon, 1845)