Hey Robo2010, Try adding just a touch of displacement, as that seems to remedy those strange artifacts. Don't ask me how, but I know it happens with the double-sided polygons. Just out of curiousity, what did you use to model the building, MAX, Maya, Silo, etc. Sometimes, when exporting, normals can get messed up. I just noticed this in your material room pic, PLEASE check the Normals_Forward box. That might just do it. -The Starkdog