Hi max,

> I suppose it's not easy to implement the continuity for network surfaces, right?

Nope, not especially easy.


> Of course, it is an option that would solve a lot of problems given by the limitations of NURBS modeling.

Not really in particular - even with that kind of continuity it's quite difficult to get good results doing a sort of "patch by patch" type approach. Usually if you're trying to build things by little separate adjacent patch pieces like that it's a signal that you would be better off doing sub-d modeling instead. That's why it hasn't been a particularly high priority for MoI to focus on that area, it's part of an finicky and advanced style of NURBS modeling, fairly different from the booleans and 2D curve drawing areas where NURBS really has its best advantages.

- Michael