Nice App Redrobes! The terrain stuff is amazing! I will have to try out the demo when I get home.

Torstan, yes I have seen that program before. Is is very cool. It might have been part of my inspiration at the time. I use something I call "shadow casting" in a similar effect. I forgot to mention the shadow aspect of lighting. It can be tough to do efficiently when there are a dozen light sources active in a scene.