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!!

@Lorenzo_Verde

Hi,

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

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