Design and Exchange of Parametric Models for Parts Library1

The common property of these systems is that their internal data structure is twofold. On the one hand, they record the explicit shape of the current designed product. On the other hand, they record the identifiers of the entities that constitute the shape, the constraints between these entities and the input values involved in these constraints, thus recording a program. Providing new input values to this program enables to create a variant of the designed shape. The underlying principles of these systems are all but new. The very innovative feature is the user friendly interface which enables to record and to trigger such a program.