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A Hermite interpolatory subdivision scheme for C2-quintics on the Powell-Sabin 12-split

Abstract

In order to construct a C1C1-quadratic spline over an arbitrary triangulation, one can split each triangle into 12 subtriangles, resulting in a finer triangulation known as the Powell–Sabin 12-split. It has been shown previously that the corresponding spline surface can be plotted quickly by means of a Hermite subdivision scheme (Dyn and Lyche, 1998). In this paper we introduce a nodal macro-element on the 12-split for the space of quintic splines that are locally C3C3 and globally C2C2. For quickly evaluating any such spline, a Hermite subdivision scheme is derived, implemented, and tested in the computer algebra system Sage. Using the available first derivatives for Phong shading, visually appealing plots can be generated after just a couple of refinements

Category

Academic article

Client

  • Research Council of Norway (RCN) / 222335

Language

English

Author(s)

Affiliation

  • University of Oslo
  • SINTEF Digital / Mathematics and Cybernetics

Year

2014

Published in

Computer Aided Geometric Design

ISSN

0167-8396

Publisher

Elsevier

Volume

31

Issue

7-8

Page(s)

464 - 474

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