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Polygon Crawling: Feature-Edge Extraction from a General Polygonal Surface for Mesh Generation

Yamakawa, Soji and Kenji Shimada

Proceedings, 14th International Meshing Roundtable, Springer-Verlag, pp.257-276, September 11-14 2005

IMR
PROCEEDINGS

14th International Meshing Roundtable
San Diego, CA, USA
September 11-14, 2005

The Department of Mechanical Engineering,
Carnegie Mellon University
soji@andrew.cmu.edu, shimada@cmu.edu

Abstract
This paper describes a method for extracting feature edges of a polygonal surface for mesh generation. This method can extract feature edges from a polygonal surface typically created by a CAD facet generator in which typical feature edge extraction methods fail due to severe non-uniformity and anisotropy. The method is based on the technique called "polygon crawling", which samples a sequence of points on the polygonal surface by moving a point along the polygonal surface. Extracting appropriate feature edges is important for creating a coarse mesh without yielding self-intersections. Extensive tests have been performed with various CAD-generated facet models, and this technique has shown good performance in extracting feature edges.

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