Hi Pilou,

> Can we do think that a concept of "good form" can be given by
> the nurbs like in the past hull boats drawing were given by
> flexible battens?

I'm sorry not quite sure what you are asking for here Pilou, are you looking for methods to automatically analyze a surface to see if it has a good shape or not?

You might try searching the web for terms like "Surface fairing" to try and find some more information on that.

- Michael