Non-uniform Rational B-splines (NURBS):

Tracing down the roots of NURBS as utilized in CAD and graphics is not easy. Though, if we consider the two major ingredients on NURBS and rational

B-splines then we may begin an overview with Coons. Coons recommended the use of rational polynomials to represent conic sections precisely. Further Forrest pursued the ideas and gave a rigorous treatment of rational conics and cubics. De Boor ,Schoenberg, Cox, and Masfield. Riesenfeld have introduced B-spline curves & surfaces into CAD/CAM and graphics. Following Riesenfeld, Versrille extended B-splines to rational B-splines. His work 1975 was the first written account of NURBS. By the late year of 1970s, the CAD/CAM industry identified the need for a modeler that had a common internal method of representing and storing different geometric entities. At about the same time, three major groups looked at the possibility of utilizing NURBS.