The zones can target curtain walls with "Linked 3D Element" property (into general property)
The curtain wall area can be found but I don't find the way to do this
Probably with a personnal property by an expression (I've seen you work with AC22) ?
Christophe - FRANCE
Archicad Designer and Teacher
Archicad 15 to 26 FRA FULL
OS 11.6 Big Sur - MacBook Pro 2015 - 16Go RAM"Quality is never an accident ; it's always the result of an intelligent effort" John Ruskin