GLU NURBS seem to use:
degree + number of control points + 1 knots.
whereas other sources declare the amount of knots for NURBS to be:
degree + number of control points - 1 knots.
What is the difference? Why the extra 2 knots? And how are they applied over the control points?
Also, does the maximum multiplicity of a knot in OpenGL = degree+1? As opposed to degree times?