Time-Compression Technologies Magazine Archive 2002 (and backfills for previous years)
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Author Abdul Shammaa
Source Time Compression Technologies. v7 n5 Sept., 2002, pp 24-26
Abstract Technical know-how and the right software can provide data transfer with a very high success rate. Today's popular CAD systems share a common technical foundation in the way solid (and surface quilts) models are internally described and represented. Of course, the specifics differ from one system to another, which give rise to the very challenges that face interoperability. Modern modeling systems define a 3-D object by its topology and geometry. Topology describes connectivity of the object boundary (Boundary Representation or B-Rep), which is defined by vertices, edges and faces. A face is itself a subset of a limited region in space defined by underlying surface geometry. Geometry describes the shape of the object, which is defined by points, curves and surfaces. Most commonly, curves and surfaces are described using Non Uniform Rational B-Splines, or NURBS. A 3-D object is only fully defined when both topology and geometry are complete and coherent. XX
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