Hi mdesign,

re:
> @Michael: Is it changing something with calulation local Normal direction from point layed over the surface?
> I see that face.evaluateNormal( uv ) and I not`t understand what is U and V values. I know UV but in
> polygonal modeling.

Every NURBS surface has a 2 dimensional UV space associated with it, it's similar to the UV coordinates in polygon modeling.


> Is it works also for rounded shapes?

Yes, it's the same for every NURBS surface. A NURBS surface is made up of a grid of control points going in the U and V directions.


> Is there some node to return U and V values for given point? I yes then it should be easy to get
> normal direction after your latest update.

Sorry no the part of calculating the U and V values that correspond to a 3D point is not set up for script access yet. The "natural" way that NURBS are evaluated is by their parameter space coordinates. Calculating the UV coordinates of a 3D point is not really a part of the natural surface evaluation, it has to be done by a more specialized kind of solver.

- Michael