Hi Steve,

> In real world, most reflections are not perfect as most
> surfaces are not perfectly smooth.

Yup, but that's one of the cool benefits to NURBS - you can do things like easily create spheres that are perfectly smooth. Then if you want them to not look smooth you put stuff like a texture on them, it gives you more options that way.

It's a whole lot easier to add in imperfections if you want them, than it is to remove imperfections if you don't want them.


That's kind of the whole reason for existence of NURBS in general - so that you can make a kind of idealized geometry design for your object. It's why manufactured objects use NURBS geometry for the model definitions for the most part.

I'm not sure if I really understand your point about "in the real world".... - surely you don't think that every kind of rendering is only about trying simulate the imperfections of the real world, right? There are various kinds of rendering styles, some of which are about making illustration type results.

- Michael