- the solution which @lucamanzoni
showed is likely your best bet. The only concern with isolines from STL imports is that the UV directions can be inconsistent based on the source model. You can add a list of both options to the IsoDirection to generate both isocurves, and then get the longer of the two curves to cover both cases. If that doesn’t work due to a more complex case, send us that geometry and we’ll go from there.
Note that getting the geometry for walls created by face that are this complex usually fails for me, as is the case here. As such you’ll either need to work with your original massing element (via the stl - this wasn’t in the file you posted though), or select the face manually. FWIW, I’d go manual selection unless you have a TON of these.
If you need model lines in Revit, this can be brought in as segments as shown. I leave it to you to know if this is acceptable or not for your uses. I copied the wall in Revit to use this as an example of how lacing and list levels can be used to batch process content like this.