PDM-UG: Additional Geometric Model Structures

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Several implementations and pilot projects have identified the requirement to handle multiple feature shapes associated with a single part.

One example is an alternate geometry representation for a part shape or a partial shape, e.g., simplified, other geometry type. The relationships of the alternate geometry representations can be defined by a representation_relationship (with e.g., name=’derived’ to state that the simplified geometry is derived from the original geometry).

Another example is the definition of auxiliary geometry not being part of the shape, e.g., tooling, test equipment or some object to provide scale of new design geometry. In this case the shape_representation is linked to a product_definition by using property_definition. Product_definition_shape is not used. The auxiliary geometry may be related to the part geometry to describe the geometric relationship.