Surface.PermimeterCurves (output Curve) gives an error at a DetailCurve.ByCurve (see fig. 1 and fig. 2 and fig. 3).
However, I see the lines in Revit (see fig. 4).
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Do anyone have a solution for this?
Thanks in advance.
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Hi @j.boonen,
First of all, thank you for your indepth explanation what is going wrong!
Those blue lines that you are seeing, are your Curves in Dynamo (All Dynamo Geometry that is not hidden will be blue and can be seen in Revit, but these are not actual Revit Lines).
Also could you share your error-message and maybe the corresponding files so we could also take an indepth look into your problem 
Regards,
Daan
Hi @Daan
First, thank you for your reply.
For the error message see fig. 1 below.
Fig. 1
Source data see download link:
https://wetransfer.com/downloads/99819625265e2faef879fda60289d77220201114193422/8d33abc2d1bb11e719f13a56fd8d16c920201114193443/197144
Thanks in advance.
The problem seems to be solved by adding the node “Curve.ApproximateWithArcAndLineSegments” see fig. 1.
However, another error has crept in (see fig. 2 and fig. 3)
Do you also have a solution for that?
Thanks in advance !
Fig. 1
Fig. 2
Fig. 3
Why do you have a code block there? Maybe you could try using a List.Flatten node instead
The code block is flattening and getting the first item. You would have to place two nodes instead of one.
Append the DSCore. before the List. to get into the proper namespace. This can also be prevented by uninstalling the Orchid package which isn’t something the original author had installed so it didn’t turn up. If I am not mistaken, the new line should read: DSCore.List.Flatten([a])[0];
