My problem:
I have a 3D DGN file with roofs.
I would like to generate a 3D house model by extruding this roofs by -20m.
This works pretty well until I export this result to a DGN file.
Every building consists now of 2 closed shapes (roof and extruded bottom) and 4 lines connecting these shapes.
What i would like to have is model with solid walls in the DGN file.
I assume i have to generate surfaces to give them a "color/texture".
But how do I do this?
Thanks in advanced for the help!
Best regards
Thomas