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this paper, all these models will be grouped under the generic name: iso-surfaces. In the iso-surface model, an object is defined by a set of primitives that can be considered as potential fields. The boundary surface of the object is then represented by the set of points for which the sum of the potential values equates a given isovalue. Two competitive approaches can be taken to create complex shapes with the iso-surface model. Either the object may be described by a very large number of simple primitives (e.g. spheres or ellipsoids) or by a small number of complex ones (e.g. distance or convolution surfaces). The first approach is well adapted to the automatic matching of 3D experimental data 11 while the second one is merely used in a design process which allows the user to define interactively each primitive
Crespin et al. (Thu,) studied this question.