Abstract
A description of the structural characteristics of a shape, e.g., sequence of shape modifications or tree of element combinations, is considered as construction history. History provides access to any modeled object at any step in a design process. Because new variants of a part often can be defined by a minor change of an existing shape, modification of a shape model using history facilitates the design of customized parts for customized products. A method called dynamic modeling represents a trend that abandons any dependence on history. This modeling isolates features but describes the geometry without any history. It accelerates design changes when local geometry and topology changes are needed or arbitrarily placed dimensions are to be defined at any stage of model construction. A model can be changed by adding, removing, replacing, repositioning, or re-attributing elementary surfaces, solid primitives, and form features in a combined shape. Temporary or part-variant dependent inactivity of elementary shapes can be set by their suppression. Information about a suppressed elementary shape remains in the model, but this shape does not affect the shape of the part.
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