Hi AlexPolo,

The attachments are the generated surface (XNurbsSurf.IGS and XNurbsSurf.stp), and XNurbsZebra.png show the zebra image of the generated surface.



Need to point out that the curve file you sent contains some bizarre curves as showing in the following image. They are obviously overlapped; I don’t understand why these weird curves are there? A mistake? So I delete them. The remaining curves also have small overlaps – they have a negative impact to the final surface quality (I did not make any correction to those overlaps). If you cannot make the curves connected with each other, then you should keep them open (i.e., leave a big gap). This way you will get a much better surface.



Kevin