Form features may be represented both as surfaces and as volumes. Volumetric features are neeessary in automated process planning for relating a feature to the extent of material to be removed from a ~and for capturing the global chamcteristics of a part, such as tool accessibility. In this paper, a method witl be presented for generating volumetric features from surface features, based on the technique of face extension. The implementation is currently limited to polyhedral parts. Examples will be given to illustrate the algorithm.
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Dong et al. (1991) studied this question.