Well, here's final version 1.7. As I promised I worked on optimizing software rendering. It is faster and, what's more important, it's more balanced, this means that speed improvement in simple scenes is less than speed improvement in complex scenes. I also implemented a new algorythm in glVIS, it's more precise, but it works slower. Also in fast mode it will perform some rough tests, and not just a empty lump. Note: there's no reason why you should rebuild already compiled vis data.