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PLEASE NOTE: The Publications System provided by the Manufacturing Systems Integration Division (MSID) has moved to: http://www.mel.nist.gov/msidlibrary/publications.html. The pages below are maintained for archival purposes only.
Publication summary
Author(s): Mike Pratt
Publication date: October 1998
Citation: Mike Pratt: "Extension of the Standards ISO 10303 (STEP) for the Exchange of Parametric and Variational CAD Models," Proceedings of the 10th IFIP WG5.2/5.3 PROLAMAT Conference [Kluwer Academic Publishers, 1998], Trento, Italy, September 1998.
Key words: CAD Data Exchange, Constraint-based models, design intent, ISO 10303, parametric models, STEP
Availability:
Abstract:
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The first release of the International Standard STEP (ISO 10303)was made in 1994. It
permits the exchange between dissimilar Computer-Aided Design (CAD) systems of
2D drawings and of product models of the boundary representation type, including
degenerate forms such as surface models and wireframes. However, the standard
cannot currently capture and exchange the parametrizaiton and constraint information
associated with the models generated by most modern CAD systems. The loss of this information
during a model transfer makes it difficult or impossible to edit the model in a
receiving system subject to the intentions of the original designer. The paper
outlines the consequences of this loss of information, and describes the current status of work
aimed at enhancing the STEP standard to enable its retention. Some of the technical
problems arising in this work are discussed and possible solutions are outlined.
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