Hmm, afaik open Subdiv is all about displaying heavy CG-meshes efficiently, and about improving
streamlining mesh + UV-texture appearance across various applications. I’ve not yet seen the
word Nurbs / Nurbs conversion mentioned in any description of open subdiv.
Am I missing something?
The linked document Autodesk document states that Speedform does use Tsplines as well as open Subdiv.