From what I understand, it works as designed, “corners” in this context mean corners in the mesh topology, not UV map. So if you have closed mesh, and you create corners in uv map by seams, those are not really seen as corners by opensubdiv.
From what I understand, it works as designed, “corners” in this context mean corners in the mesh topology, not UV map. So if you have closed mesh, and you create corners in uv map by seams, those are not really seen as corners by opensubdiv.