How to extract and transform a Curve from "ElementCurveReference" in a Linked File?

Geometry
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Hi everyone,

I am currently working on a Dynamo script for a Civil Engineering project where I need to extract specific edges from a Linked Revit File.

The Setup:

I am using the node “Select Reference on Element” to pick an edge of an element inside a Linked Instance.

This returns a Dynamo wrapper: Revit.GeometryReferences.ElementCurveReference.

I have already retrieved the RevitLinkInstance, the Link Document, and the TotalTransform of the link.

The Problem: I am struggling to convert this ElementCurveReference back into a tangible Autodesk.Revit.DB.Curve or Edge to using in host file. Since it is a Reference to a linked element, typical methods like .Curve or .GeometryCurve on the Dynamo object return empty or error out.

Any Python snippets or logic advice would be greatly appreciated!

Thanks in advance!

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Hello @mr.engineer.aec is it something here you are after ?

Revit_q5PHS8kk82

2 Likes
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Exactly, that’s exactly what I’m looking for! Please share the Python code if possible. Much appreciated

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yeah sure, but will first be tomorrow, not at dyn today :wink:

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That’s awesome, thank you so much! I really appreciate your help with this.

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yeah try something here and here if you need transform from link as well…should work with cpython3 or pythonnet3, give it a try :wink: :wink:

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forum edges.dyn (11.6 KB)

3 Likes
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Thanks a lot for the help! The script works perfectly now. I really appreciate you sharing the logic for selecting edges in linked files!

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