topic Re: Using Dynamo nodes with the Revit API in Revit API Forum

Using Dynamo nodes with the Revit API

amir.dU8TAR — Thu, 16 Jan 2025 07:54:41 GMT

Hi there,
Im coming with a background of the Revit API with C# and python.

I am wondering if is there a way to take out some functions from Dynamo and use their implementation with the Revit API.

Alternatively, maybe look “under the hood” of Dynamo and see how a specific function is implemented.

To be more specific, for some reason in the Revit API the ExecuteBooleanOperation method doesn’t work, but in Dynamo it does (its called Solid.ByUnion).

Apparently the issue with ExecuteBooleanOperation in the Revit API is familiar and all the suggested solutions for it requires complicated workarounds which I’m trying to avoid. I’m also trying to avoid writing my add-in using Dynamo as its going to be long and I’m not fluent in it.

I tried Running a python script up until the point where I have to use the Solid.ByUnion node, but the node did not accept my array of Solid instances. it seems that the type of Solid in Dynamo is not the same type as Solid in the Revit API. Im not sure about it but it seems like the Dynamo does not uses the same classes as the Revit API.

So if possible and someone can point me in the right direction on how to extract a function from Dynamo please.

Betreff: Using Dynamo nodes with the Revit API

Niko_Davydov — Thu, 16 Jan 2025 08:52:07 GMT

hi @amir.dU8TAR ,

i think it should help Exploring the Dynamo API with C# | Autodesk University

best regards,

Nikolai Davydov

Re: Using Dynamo nodes with the Revit API

sensiblehira — Thu, 16 Jan 2025 16:30:42 GMT

Dynamo Geometries are different than Revit Geometries. The Solid.ByUnion method of Dynamo takes Dynamo solids as an input not Revit geometries. what you will have to do is in your code maybe load dynamo libraries. Extract geometries of your Revit Elements and convert them into Dynamo geometries do the tasks that you need to do and convert the resulting geometries back to Revit geometries and use them as you want.

Re: Using Dynamo nodes with the Revit API

amir.dU8TAR — Wed, 05 Feb 2025 13:00:14 GMT

@sensiblehira @Niko_Davydov Thank you guys, I will look into this

Re: Using Dynamo nodes with the Revit API

ctm_mka — Wed, 05 Feb 2025 20:51:12 GMT

alternatively, do it all in dynamo, take the C# portion up till the point you need Solid.ByUnion, write it as a zero-touch node. You will still need to convert to dynamo friendly objects, but that should be easier in Dynamo.