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Camera ortho doesn't show some roofs, although each building has a roof.
Tried to flip normals, doesn't work.
All the roofs are displayed in top ortho perspective
Tried Clipping, doesn't work
The problem is mainly due to the camera Z position which is below top roofs (and so due to some limitation can't see them).
Move your camera up.
And adjust the following values:
Required, but never shown