I was wondering if it is possible to use mesh vertices with double precision from RhinoCommon. I know they are available in C++, but I can’t seem to find any clue about it in the .NET API.
No such luck. This might already be on the pile. But here is an issue you can track.
seem that Rhino 6 has already implemented, great!
https://developer.rhino3d.com/api/RhinoCommon/html/P_Rhino_Geometry_Collections_MeshVertexList_UseDoublePrecisionVertices.htm