I´m trying to do geometry repair for a 3D model of a city. After geometry check, I´ve got many self-intersecting polygon errors, but when I apply repair tool, polygons that represent walls disappear and only polygons of roofs are left. In attribute table, everything is still there, I just can´t see walls on the buildings anymore.
I looked at this thread repair geometry - self intersections but it didn´t help.
I´m new to this, so maybe I´m missing some fundamental step in the process, that I´m not aware of. I´ll appreciate any advice. Thanks.