Hi all,

thanks for the tips. Using Crease Angle = 22,5 solved it. I forgot that the window frames are beveled, so 80 was not low enough. But even then, I thought that switching off smoothing avoids this "surface smoothing" at all. When I made the screen shots smoothing was off, but I still got the unwanted shading. So last question is, how to switch off "surface smoothing" completely? Is it possible at all, or is the only solution to split the edges where required?