Mesh data operation

[mrhe (Mariusz Hermansdorfer)]

For mesh traversal, you’d need to use topology vertices:
https://developer.rhino3d.com/api/rhinocommon/rhino.geometry.collections.meshtopologyvertexlist?version=8.x

To wrap your head around the relationship between a regular vertex and its topological counterparts, check out this great breakdown by @RIL

Difference between MeshFace Vertices & TopologicalVertices?

No, unfortunately. I don’t remember from which code example that code snippet was. But to explain that single row of code I made an illustration to show how Mesh.TopologyVertices relates to Mesh.Vertices. TopologyVertices typically represents a “location”, say the center of the illustrated eight-faced group. The face group has altogether 8 faces, which makes for nine (9) “locations” (corners). (The illustrated faces are shown on different levels to give some room for the numbering). All the …