Get "IsExternal" Elements?

Hello,

I try to get my external elements with a room(SkyRoom).
the idea is to inverse my room faces! to get the elements. It does not work, even with more simple geometry?

I want to get a list of “air-touched” Elements and set IsExternal to true!
if no one else has an workflow i will do it manualy :frowning:


KR

Andreas

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