Damocles: I'm not really sure what you mean about bumpmaps. Shaders on level geometry is incredibly slow right now, and this was built for speed on low end computers. If you would like to see some of my work with shaders check out my site. I do agree to a point about the dirt, though, but like I said this has been done for over a year now, and I think many people like to hide poor level design with grunge.