I'm attempting to add some of the overlays to fine tune my map. I'm having issues though. I looked at the 2fort map to see what they did, but for some reason when i make an entity, set it to info_overlay, and set a material to say a storage sign, its not showing up. I also am not sure what the difference between using decals as opposed to overlays does, as well as which materials for which one. Should I just be using the overlay tool?