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Generation of Spline Approximations to Tessellations

Dannenhoffer III, John F. and Robert Haimes

Proceedings, 17th International Meshing Roundtable, Springer-Verlag, pp.249-266, October 12-15 2008

IMR
PROCEEDINGS

17th International Meshing Roundtable
Pittsburgh, Pennsylvania, U.S.A.
October 12-15, 2008

Syracuse University, Syracuse, NY, USA
jfdannen@syr.edu
Massachusetts Institute of Technology, Cambridge, MA, USA
haimes@mit.edu

Abstract
In geometrical modeling, one is often provided a description of a surface that is defined in terms of a triangulation, which is supported by a discrete number of nodes in space. These faceted surface representations are defined to be C-0 continuous, and therefore in general have slope and curvature discontinuities at the triangle sides, unless the tessellation is planar. Unfortunately, analytical and computational methods often require a surface description that has well-defined and smoothly-varying gradients and curvatures; in general spline surfaces possess such properties. Described herein is a process for generating a cubic spline surface that approximates, to within a userspecified tolerance, a given tessellated surface that may be non-convex or multiplyconnected. The method combines a local least-squares technique for specifying knot properties as well as an adaptation technique of selecting the necessary knot spacings. This new technique is first described along a curve for illustrative purposes. It is then expanded to the case of the general surface. A reparameterization technique that is required for surfaces with non-smooth parameterizations is described next. Computed results for two configurations are then shown.

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