Meshing and Modo?

 From:  jbshorty
If you weld, then Modo recognizes the whole mesh as one surface. So double-clicking will select the whole mesh. But if you want to have ability to select each surface more easily you should export unwelded. It will make UV layout much easier. Then later in modo you can run Vertex > Merge at distance of zero units. And that will effectively weld the edges, but won't damage the UVs...