Hi Dean, I got the aquatica reef to render fairly quickly without any modifications to the reef texture maps; however, with the atmosphere (even without aquatica reef), the renders took a long time (on a P4 1.8 GHz, 512 RAM, 64 MB video RAM, 7200 rpm 60 GB HDD, Win XP Pro, Poser 4.03). Did you experience this as well? How long did it take to render your image and is there a way to speed up renders with just the atmosphere (I don't think it uses any texture maps), e.g. for foggy or underwater scenes, etc. And how did you do those great-looking "shafts of light" effect?