>>MR SKY and MR SUN.<< There are some new Physical Sky options in Max 9 MR that you wouldn't have in VIZ2007 and I'm not sure how deeply it's investigated in this book. You'd probably be better off waiting until the VIZ is shipping with a comparable version of MR. Don't forget that VIZ2007 won't open Max 9 files, so the samples would be of no use even if the process was the same. In my estimation, MR is something to use when you've exhausted the scanline renderer, too. MR isn't a fix for fundamental lighting problems and is much too slow for general use. Good luck Ted