SISL 4.6.0 (new formula)

SISL is a NURBS (Non Uniform Rational B-Splines) software library developed and maintained by the geometry modelling group at SINTEF ICT, Department of Applied Mathematics.
http://www.sintef.no/Informasjons--og-kommunikasjonsteknologi-IKT/Anvendt-matematikk/Fagomrader/Geometri/Prosjekter/The-SISL-Nurbs-Library/SISL-Homepage/