Get Walls Inner Perimeter + Beam System

Hi everyone!
Any ideas how to get the inner perimeter of some walls at a certain level !?
I tryed to set the union of the four surfaces, to get the inner and the exterior perimeter… but it didn’t work…

Moreover, i should create inside this perimeter a system of transoms and mullions.
I found out this way but it doesn’t work if the plant is irregular…

thanks in advance!!



You can try using clockwork package “Surface.FilterByOrientation” node to get walls inner perimeter. Good luck!

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