I’m having trouble figure out what’s going wrong here - I think all my inputs are set up correctly but “DuctRound.ByLines” node is only returning null, not creating ducts.
It would help if you provided another image (make sure all node titles are visible by using Export Workspace), but you’ll probably need to pull out the “logic” (python or graph) of the custom node and run it from your graph environment to check any warnings.
You would have to plug everything in and run the python node instead of the custom node. If you don’t plug anything in then of course you won’t get anything back expect a null reference error.
Let try with this one :
https://chuongmep.github.io/OpenMEP/api/OpenMEPRevit.Element.Duct.html#OpenMEPRevit_Element_Duct_CreateByLine_Revit_Elements_Element_Revit_Elements_Element_Revit_Elements_Element_Autodesk_DesignScript_Geometry_Line_
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The same error message comes up even when they are all connected
Thank you. I’m trying this method now; it keeps crashing my computer though