Robust geometric computation: Difference between revisions

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Geometric objects on a digital computer are composed of two types of data:
numerical and combinatorial. Examples of numerical data include the
Cartesian coordinates of a point in 3-space, the length of a line segment
connecting two such points, or the angle between two such line segments.
Examples of combinatorial information include grouping two points as an
edge, grouping a collection of edges as a face, or grouping a collection of
faces as a surface.