Trying to Solid.ByUnion but getting null

Hello, I’m trying to join solids that were created inside dynamo (from a Revit file in the example a window)
but in some cases (types of windows\doors\Curtain wall) the node will not work and will give null.
I’m adding a picture + file.
B.t.w: the goal is to create 3 sections around each element for CD.
Thank you.[

Windows section1.dyn (144.3 KB) ](http://)

What does the error say?

1 Like

Have you tried flattening the list before union?

You may have coincident edges.

Is there a way to get over it?

You would have to modify the family geometry.

I though that might be the case, I’ll try a different way, Thank you.