Hi, I’m looking for a way to convert a Brep (has extrusion shape) into an Extrusion object. Looks like the ConvertExtrude command exists if we look here: General Rhino options that control menu functions, undo, and start-up commands. Extrude comm…

Hi @sonderskovmathias , That ConvertExtrude converts extrusions to breps. Basically what “.ToBrep()” method does. You are looking for the opposite functionality?

Ah yes, what a shame - I was looking for the opposite. I know it is not that straight forward nor as computationally lightweight, but I thought it already existed that’s why I asked. My misreading.

In my knowledge no such RhinoCommon method exists (convert Brep to Extrusion). Unless something changed in Rhino 8 recently, but I doubt. I would say, you have to make it with Rhino.Geometry.Extrusion.Create, by using the outer curve of the brep’s “extrusion like face” (for a cylinder, that would …

[image] Mathias Sønderskov Schaltz: I’m looking for a way to convert a Brep (has extrusion shape) into an Extrusion object. I’m having trouble imagining how that would work without more information. On the computational side, would it start guessing faces and edges to extrude from and an ext…

Hi @sonderskovmathias , There isn’t anything in Rhino to convert an extrusion-compatible Brep into an Extrusion. I know we’ve mulled this over. – Dale

Convert Brep to extrusion (RhinoCommon)

Rhino Developer

dan (Dan) December 23, 2025, 10:20pm 7

RH-54045 is fixed in the latest Rhino WIP.

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Convert Brep to extrusion (RhinoCommon)

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