Hi Anis,

> I think we need more and more curves to make network smooth.

Actually unless your new curves are very precisely placed, adding more and more curves tends to increase ripples and buckling, not decrease it.

To get smoother results, you should actually generally try to reduce the number of curves that you're using rather than increase it.

You may be forced to increase it if you want to more explicitly control where the surface is passing through, but more constraints tends to mean more rippling, both for network and interpolation in general.

Using the minimal amount of curves that are required usually helps get smoother things. Try to make adjustments to those curves to increase their quality which will help more than adding things often.

- Michael