SoNurbsCurve(3) on Linux
The text 8e702ac7ec6b, as Debian 4.0 (Etch) shipped it.
The SoNurbsCurve class is a node for representing smooth curves. Explaining NURBS is beyond the scope of this documentation. If you are unfamiliar with the principles of representing smooth curves and surfaces when doing 3D visualization, we recommend finding a good book on the subject.