Hi

so i think everyone here was right a little bit. in the end it might had to do with bended borders or whatever. I exported an Object from a libary and took a look, so it seams that all borders where cut. So i did the same and my model looked better. In the end now i have to admit that the way i did the modelling was crap. I have now redone the walls with simple planes and cut the windows, extruded them and cut the edges of.

The result is excellent now, even with the material i applied.

thanks for all your help! Very much appriciated!!!

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