Using semi-implicit representation of algebraic surfaces

Laurent Busé 1 André Galligo 1
1 GALAAD - Geometry, algebra, algorithms
CRISAM - Inria Sophia Antipolis - Méditerranée , UNS - Université Nice Sophia Antipolis, CNRS - Centre National de la Recherche Scientifique : UMR6621
Abstract : In a previous work we introduced a new general representation of algebraic surfaces, that we called semi-implicit, which encapsulates both usual and less known surfaces. Here we specialize this notion in order to apply it in Solid Modeling: we view a surface in the real space as a one-parameter (algebraic) family of algebraic low-degree curves. The paper mainly addresses the topic of performing the usual CAD operations with semi-implicit representation of surfaces. We derive formulae for computing the normal and the curvatures at a regular point. We provide exact algorithms for computing self-intersections of a surface and more generally its singular locus. We also present some surface/surface intersection algorithms relying on generalized resultant calculations.
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  • HAL Id : inria-00100310, version 1


Laurent Busé, André Galligo. Using semi-implicit representation of algebraic surfaces. Shape Modeling and Applications Conference, Jun 2004, Genova, Italy, pp.342-345. ⟨inria-00100310⟩



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