Get exterior face of a wall

Viktor…im sorry…every time i think this is the solution, another problem pops out.

I need the surface of the hole wall, or of the 3 walls.
The separation of the surfaces happens in “Solid.ByUnion” i think.

Any idea what i can do against this? or work around?

it should still work if they are 3 separate walls
Anyway what are you trying to accomplish eventually? Maybe there’s better approach.

Well, after i got the 7 exterior surfaces i intersect them with the xy-plane at z=0.
Than i got 7 lines, each line for each wall. This is important so my programm after this step can continue.

There is a note for walls were i can get the interior lines. But these lines are to short…

If the goal is to get the lines only and you don’t need the actual surfaces I’d go with something like this:

sorry,your output is not what i need
I need these lines:

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thanks 2pic nice

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