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 The Application of Winding Numbers to the Interior Problem of Nonconvex Polygons and Polyhedra
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 1999 International Mathematica Symposium
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 The winding number for closed curves and polygons in the Euclidean plane is generalized to polyhedra in three-space. The winding number allows to decide whether a point is in the interior or exterior of a closed polygon/polyhedron. Polygons and polyhedra need not be convex and self-intersections are allowed.
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 winding number, closed curves, polygons, Euclidian plane, non-convex polygons
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 http://www.internationalmathematicasymposium.org/IMS99/ims99papers/ims99papers.html
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