I have made a simple 3d city for a project I am working on. I was thinking about makeing a night scene but I want a simple way to add windows to the buildings. the buildings are just simple boxes and cylinders. Right now I just have a simple bump map on them to make it look like they have detail on them. I was thinking that maybe I could just make some sort of texture map that had glowing squares representing windows but I dont know...any good suggestions?