If you look at the attached file, you will notice that in the Aerial View a part of one wall "flickers" when rotating the 3D view.
I checked twice, closed SH3D and re-opened it, disconnected all corners, made sure there is no overlap anywhere. Still, the flickering remains. I marked the wall with text and arrow.
Is this an "undocumented feature" or a little bug??
The wall you indicated in your file flickers because there are two walls at that place oriented in opposite direction. One of the wall is black and the other one is grey.
As there is a grey and a black surface at the same place, the 3D renderer has some problems to choose the color to display, i.e. once it's black and the second time it's grey due to small computing errors.
