NURBS with extraordinary points: high-degree, non-uniform, rational subdivision schemes

  • Authors:
  • Thomas J. Cashman;Ursula H. Augsdörfer;Neil A. Dodgson;Malcolm A. Sabin

  • Affiliations:
  • University of Cambridge;University of Cambridge;University of Cambridge;Numerical Geometry Ltd

  • Venue:
  • ACM SIGGRAPH 2009 papers
  • Year:
  • 2009

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Abstract

We present a subdivision framework that adds extraordinary vertices to NURBS of arbitrarily high degree. The surfaces can represent any odd degree NURBS patch exactly. Our rules handle non-uniform knot vectors, and are not restricted to midpoint knot insertion. In the absence of multiple knots at extraordinary points, the limit surfaces have bounded curvature.