and surfaces are the industry standard for geometry description
in CAD/CAM or Computer Graphics.
are piecewise rational; they are the logical
extension of B-spline or Bezier entitities.
have their roots in affine
geometry, NURBS cannot be understood without paying attention to
in projective geometry - this constitutes the first part of the
foundations have been laid, rational conics and Bezier curves are
rational B-spline curves (NURBS) follow. As a further extension,
the surfaces corresponding
to these curves are also introduced. Applications include Pythagorean
and developable surfaces.