FINDSPAN  Find the span of a B-Spline knot vector at a parametric point

 Calling Sequence:
 
   s = findspan(n,p,u,U)
 
  INPUT:
 
    n - number of control points - 1
    p - spline degree
    u - parametric point
    U - knot sequence
 
  OUTPUT:
 
    s - knot span index

  Modification of Algorithm A2.1 from 'The NURBS BOOK' pg68

    Copyright (C) 2010 Rafael Vazquez

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

Package: nurbs