Find relevant vertices in subdivided mesh

Please see screenshot enclosed.
Upper mesh is the subdivision result of the lower one. Indexes are marked with blue color.
How to find relationship between vertexes in base and subdivision mesh?

What I mean is the following: I need to know what index will be assigned to corresponding vertex 3. Here answer is 19.

Thanks in advance,

Hi @Dmitriy,

How are you subdividing the mesh?

– Dale

Hello @dale

I am using Mesh.CreateRefinedCatmullClarkMesh method


Sorry, this is something that is subject to change once the RhinoCommon SDK is switched to use C++ SubD functions. I do not know what the C++ SDK order will be, maybe @dalelear will be able to help then, but this part of the SDK is not ready for public use, sorry.