Eh, a quick, slightly off-topic question: I really loooove GI, but what is this light sphere stuff that keeps popping up? I thought that was something that helped actually faking Global Illumination. I tend to use the bi-gradient stuff for setting op the stuff. In what situation would a light sphere be better? As I remember from previous threads, a light sphere is a giant, well, sphere, surrounding the scene and camera's and all, with some amount of glow assigned to it, right? I will be following your tank!