Hi Alex,

Re:
> I did think there was an underlying structure difference between
> Parasolid and Open Nurbs and the way the surface was created.

I doubt this has anything to do with Parasolid vs OpenNURBS. Both are capable of analytic representation of a torus.

Re:
> That solid imports into PIPEBEND aok so strange it structures the
> surfaces in some instances in same fashion and then in other style that
> PIPEBEND cant read.

I'm guessing that Pipebend is smart enough to look at general surfaces and check whether they are sufficiently close to being a true torus. The key word here is "sufficiently" because if MoI and Pipebend use different tolerances for "close enough" then sometimes they are going to agree, and sometimes not.

One thing you could do is look through the Pipebend settings to see if there's an import tolerance setting somewhere. If there is, you could try setting it to a larger number like 0.03 mm.

- Peer