Hi Steve, well that approach of shifting control points just at the end as NX does produces bad geometry errors in other situations, see this previous post in the thread where I describe it in detail:

http://moi3d.com/forum/index.php?webtag=MOI&msg=3575.11

Is that kind of self-intersecting geometry what you would consider a proper result?

Not only that, but taking a section through the result you posted also shows distortion as well:




Right now it seems like that is not the best way to go, it seems to be a more risky approach with it making bad results on shorter pieces, although it does help with making the distortion located more at the end on longer pieces.


- Michael