What's the equivalent of Rhino's "create solid" from bouding surfaces in Grasshoipper?

Grasshopper
1

As shown below :

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2

Check Boundary Volume(Intersect–>Shape–>Boundary Volume)

3

I don’t know if there’s a native component for doing this (because I don’t work with components - at all) … but the Method is exposed in the R SDK:

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If you want an entry level C# that does that (result(s) are very slow mind) notify.