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CAD Geometry Data Exchange

Objective

The objective of this project is to support and further develop the ISO STEP standard for a neutral file format for CAD data exchange by:

- proving the practicality of the standard
- providing application protocols for the efficient use of the standard
- developing comprehensive implementations for CAD geometry exchange
- implementing state-of-the-art testing methodologies
- developing pre- and post-processors to interface a range of CAD equipments and Finite Element Modelling (FEM) systems.
Problems (completeness, correctness) in computer aided design (CAD) geometry data exchange have been overcome.
Contribution has been made to the international standard STEP (ISO 10303).
Application protocols for solid (Brep and CSG) models, surface models and wireframe CAD models have been determined.
A prototype was made available on 14/02/92

Format specifications for the transfer of data between computer aided design (CAD) systems have been drawn up and standards set. Software for reading, writing, handling, converting and checking data has been written and microprocessors developed.

Five application protocols have been instituted, for manifold solid boundary representation models, surface models, wireframe models, compound boundary representation models and constructive solid geometry models. The first 3 have been forwarded to the International Standards Organization (ISO) to become part of the standard ISO 10303 (STEP).

Processors for the transfer of data have been developed by each CAD vendor in the project for their own CAD system. The processors communicate on one side with the standardized data files, and on the other with the native data repositories.
The project will continue the work of ESPRIT project 322, which led directly to the STEP standard.

A subset of STEP covering 3-D design will be defined and tested by prototype processors. All these processors are based on one set of COMMON TOOLS including a "Data Structure", a "Scanner/Parser", a "Conversion Toolset", a Formatter" and some "Statistics". The processors support five official application protocols:

- wireframe geometry, ISO 10303 part 206
- surface geometry, ISO 10303 part 205
- boundary-represented geometry, ISO 10303 part 206
- constructive solid geometry, ISO 10303 part 206
- compound boundary-represented geometry, ISO 10303 part 206.

Coordinator

Gesellschaft für Strukturanalyse mbH
Address
Pascalstraße 17
52076 Aachen
Germany

Participants (13)

BAYERISCHE MOTOREN WERKE AG (BMW)
Germany
Address
Petuelring 130
80809 München
DET NORSKE VERITAS
Norway
Address
Veritasveien, 1300
1322 Hovik
DISENO INGENIERIA DE SISTEMAS ELECTRONICOS
Spain
Address
Av.burgos, 8-B
28036 Madrid
FEGS Ltd
United Kingdom
Address

CB4 5BA Cambridge
Fiat SpA
Italy
Address
Corso G. Marconi 10-20
10125 Torino
HEWLETT PACKARD
Germany
Address
Herrenbergerstraße 130
71034 Böblingen
ISYKON SOFTWARE
Germany
Address
Kohlenstraße 55
44795 Bochum
Italcad Tecnologie e Sistemi
Italy
Address
Via E. Ravasco 10
16128 Genova
NORSK DATA
Norway
Address
Schwabengate, 5489
3601 Kongsberg
PROCAD GMBH
Germany
Address
Haid-und-neu-straße 7-9
76131 Karlsruhe
SENTER FOR INDUSTRIFORSKNING
Norway
Address
Forskningsveien 1, 124
0314 Oslo
SIEMENS AG
Germany
Address
Otto-hahn-ring 6
81739 München
University of Leeds
United Kingdom
Address
Arndale House
LS6 2UU Leeds