I have a mesh that I need to export as 3ds, and thus have to keep it under the max polygon count limit (65536 (64k)) for 3ds for it to stay together as one part.
I then looked at the mesh properties it tells me that it has 51915 polygons, so all was fine…
So I exported and imported and to my surprice it came back in as two parts, so I selected the original mesh and typed ReduceMesh, but that showed a different meshcount:
Now what is causing that???
The mesh was generated in Rhino from a joined pipe structure, and the mesh is smooth and clean.
You can test this by simply making a curve, pipe it, mesh the pipe and check.