Hi Pilou,
> Skecthbook is not only 2D prog?
Yes, I believe so.
> So curves must be more easy to manage?
It depends on the particular technology that is used for the curves. There are several kinds of curve mechanisms that work the same between 2D or 3D curves, but there are also some that are focused on 2D curves only.
It's likely that sketchbook uses NURBS curves though since that is what other parts of the Alias modeling software has used in the past though.
- Michael
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