Get the exterior side of a curtain wall

Revit
2

For the flipped walls issue:
There is and API property of a wall class that tells if it has been flipped. You can easily check it with a simple python node:

import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *
#The inputs to this node will be stored as a list in the IN variables.
walls = UnwrapElement(IN[0])
flipped = []
for w in walls:
	flipped.append(w.Flipped)

#Assign your output to the OUT variable.
OUT = flipped

obraz

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