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Hi all, today I have the same problem but I have solved it. The sequence of the vertexes should be clockwise in the first surface and counter clockwise in the mirrored surface. If you have a surface with four vertexes 1-4, they are for the mirrowed suface the other way round: e.g

• surface -> mirrored surface
• 0,0,0 vertex 1 -> vertex 4
• 1,0,0 vertex 2 -> vertex 3
• 1,0,2,vertex 3 -> vertex 2
• 0,0,2,vertex 4 -> vertex 1

I have changed it manually in the osm file. Maybe there is a more elegant way.