Hi tyglik,

I used the parameters you gave me in rhino40 :
edge curves: 0.001
interior curves: 0.1

the picture shows the result

Before DannyT gave me the solution (changing unit size in meters)
i worried i little bit seeing that surface error,and concluded that
even in moi3d,Nurbs have their limits.

I tried to use Sweep with two curves it didn't get any better

I still consider the information you gave me and will use it,
to make better surfaces ,thanks!

Michael, thanks for your info

Here you see the progress: