How do i get external curve on combined surface

hi all,

I would like to ask how do get the external curve of the combined area surface as the screenshot below, any guide will be much appreciated , thank you !

Create an polysurface and extract the perimeter curves.


Thank you for guidance, I completed the script with surface.byunion and perimetercurves as what you shown , sharing here is the script if is a help to anyone

Crop view to room boundary_final.dyn (46.7 KB)

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