What about the bevel edge shader?
(EDIT)
Oh wait, I just saw this the other day. I don’t know for sure what the end result is that you’re needing but I know there is curvature in this one:
What about the bevel edge shader?
(EDIT)
Oh wait, I just saw this the other day. I don’t know for sure what the end result is that you’re needing but I know there is curvature in this one: