Hi Michael,

Thank you very much for your prompt reply.

But...i must admit that, although your indications were exhaustive,
they are doubtless for anyone who's more experienced than me in the nurbs's world.

Could you please translate the concept illustrated in the first part of your reply,
in a more concrete example or in a more easy language ?

> There would not really be any kind of "improvement" to your object by what you are trying to do,
> and in fact it would usually result in worse geometry because you would no longer
> have lines being turned into analytic plane faces when they were extruded,
> you would instead have a general surface object which would no longer
> benefit from more simplified calculations like intersections and projections.

I mean.....

As i tried to express in my previous post (http://moi3d.com/forum/index.php?webtag=MOI&msg=7912.3),
i thought that, as showed in the attached file example2.3dm and the relative picture,
the surfaces obtained without seams, or with the minimum amount of seams,
are better suited for filleting or boolean operations, for example.

Or that a surface without seam could be better rendered or could present a finer surface curvature continuity.

Is it correct to think that, having less seams in a surface, could lead to be able to
create things like fillets and blends, without the need of merging the edges ?

I'm sorry if i wasn't clear and i hope you have the patience to explain me the concepts that i misunderstood.

Thank you very much,
Marco.