Parametrization of approximate algebraic surfaces by lines

  • Authors:
  • Sonia Pérez-Díaz;Juana Sendra;J. Rafael Sendra

  • Affiliations:
  • Dpto de Matemáticas, Universidad de Alcalá, E-28871 Madrid, Spain;Dpto de Matemáticas, Universidad Carlos III, E-28911 Madrid, Spain;Dpto de Matemáticas, Universidad de Alcalá, E-28871 Madrid, Spain

  • Venue:
  • Computer Aided Geometric Design
  • Year:
  • 2005

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Abstract

In this paper we present an algorithm for parametrizing approximate algebraic surfaces by lines. The algorithm is applicable to @?-irreducible algebraic surfaces of degree d having an @?-singularity of multiplicity d-1, and therefore it generalizes the existing approximate parametrization algorithms. In particular, given a tolerance @?0 and an @?-irreducible algebraic surface V of degree d, the algorithm computes a new algebraic surface V@?, that is rational, as well as a rational parametrization of V@?. In addition, in the error analysis we show that the output surface V@? and the input surface V are close. More precisely, we prove that V@? lies in the offset region of V at distance, at most, O(@?^1^/^(^2^d^)).