Hi, is this the quickest way to get a walls floor plan plane outline in processing terms?
Perhaps… although if all walls are room bounding utilizing the plan topology and/or room classes of the Revit API may be better.
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is there a way to extrude a curve both ways? Or would you have to offset curves and then do it? which feels tricky. Or extrude one way then the other then union.
I would shift the plane down 500 and extrude 1000.
Turns out I had to turn the surfaces into thin solids as its more reliable clashing. So I could use your idea and extrude up 1 and then thicken to the walls thickness. Got everything running reasonably fast now though. Updated 2700 apartment elements in 2min 
I should say, doors, rooms and windows logically. Quite happy with this one
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I wonder if faces is faster then element.getlocation and extruding 
