Describe Non-Uniform Rational B-Splines (NURBS) #14

See also #11.

https://en.wikipedia.org/wiki/Non-uniform_rational_B-spline

knots, control points, weights

Like B-splines, NURBS are approximating splines, i.e. the curve typically does not pass through its control points.

X3D provides NurbsCurve, NurbsCurve2D, NurbsCurveInterpolator etc.

http://libnurbs.sourceforge.net/