Selection of building footprints, and region union not working

[diellzaelshanni (dieilish)]

Hello people,

I need to select the only the outer contour - the footprint of some buildings(which are in the same level) as curves-or surfaces and unify their regions afterwards, does anyone has any suggestion or Gh definition on how to do it?
I tried some ways, as simple as it seems it is not working .

Many thanks in advance
D

[Rickson]

How would you do it in Rhino? typically this is same way you script it as well. Any workflow is dependent on particular geometry you are working with..

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[diellza.elshani.fl (DE FLI)]

Thanks for replying.
Buildings_outline_error.gh (7.2 KB)

Well basically I exploded the building geomtries and selected the lowest surface like in the attached definiton. I guess it workes for some simple geometries but not the a quarter.

[diellza.elshani.fl (DE FLI)]

Buildings_outline_error-Internalised.gh (590.6 KB)

[Rickson]

[diellza.elshani.fl (DE FLI)]

thanks Rickson, that actually helped a lot!