Hi mir4ea,

> I saw a lot of "Class A " expression around this software and I don't understand for sure
> what it means?

Like Burr says usually "Class A" refers to the exterior visible surfaces of the automobile. Often times it also means doing G2 continuous surfaces as well.


> and moi is good to make this "Class A " surfaces?

MoI is not really targeted on that kind of surface, but it does have some curvature continuity tools in it, like G2 blends. But if this is a major focus for you, you might want to use a different tool like Rhino which has some additional continuity controls in it. In the future I want to add more controls for that in MoI as well, but it tends to be a pretty tricky and advanced area in NURBS modeling and so it has not been a focus for MoI so far.

- Michael