Hi, this topic isn’t new… Kulkul answered this question in http://dynamobim.org/forums/topic/always-get-the-outer-faces-of-walls/ [image] but i don’t understand why he gets 8 exterior wall faces… I only need the 4 exterior wall faces. How do i get them?

Well this could be one way: [image] Although I have a feeling that it might not be the smartest way.

Yes, this could be a way, but only if the walls are in a rectangle shape. If there are more than 4 corners this would not work.

I disagree on that point. [image]

It worked for me. But now i have a following question. I want to get the intersection line from every surface with the xy-plane at z=0. I do this, but now i got 9 instead of 7 intersection… [image] What im doing wrong? Eddit: I got 3 Lines for the middle wall, because i have 2 doors:(

@Hannes Here is another possible way: [image]

see if that topic helps: [image] Get an outer boundary of multiple polygons (Room Boundaries) Geometry I’m almost achamed of how dirty it is … smile but works! [image] in designscript: [image] pc = PolyCurve.ByJoinedCurves(c); dist = 500; co = Curve.Offset(pc, dist);…

Thx for help. I got a solution for the problem with the doors in the walls. create boundingbox for every exterior surface get min and max from every bb get x,y for every min and max point create points create line by start and end point [image]

Well…i still have a mistake in my programm… [image] Did u see what is wrong?

set the lacing of Geometry.DoesIntersect to cross product and the lacing of Flatten to longest

i did what u say…but the result is not better. Also try set lacing of Flatten to shortest [image]

Get exterior face of a wall

Revit

Kulkul April 4, 2017, 5:33pm 9

@Hannes Here is another possible way:

Get exterior wall area from each room

Centroids of Exterior and Interior walls

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Get exterior face of a wall

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