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Book Contributions



This work gives an overview on representation and processing of geometric models. Volume based representations (e.g. voxel rep.) and boundary representations (planar polygons, parametric surfaces defined by a map from 2Dspace to 3Dspace, especially spline surfaces and trimmed surfaces, multiresolutionally represented surfaces, e.g. waveletbased surfaces and surfaces obtained by subdivision schemes) as well as explicit or implicit mathematical object representations are described and compared. The rather new method of "Medial Modeling", where an object is described by its medial axis and an associated radius function, is also presented. This medial modeling concept developed at the Welfenlab yields a very intuitive user interface useful for solid modeling, and also gives as a byproduct a natural meshing of the solid for FEM computations. Finally additional attributes that can be attached to an object, i.e. attributes of physical origin or logical attributes, are discussed.
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