By I. Bey (auth.), E. G. Schlechtendahl (eds.)
Principal authors: U. Kroszynski, B. Palstr9Sm 1.1 The evolution of ideas and standards for CAD information trade The CAD/CAM neighborhood has witnessed, over the past decade, the looks of numerous requirements in addition to proposals for criteria which both try to disguise wider components or to be extra trustworthy and solid than the others. With the speedy evolution of either and software program, the services provided through CAD platforms and CAD established software platforms are way more complicated than they have been basically ten years in the past, even if they're now in line with micro-computers or own comput ers. the placement with criteria, besides the fact that, isn't and can't be so. with a view to be trustworthy and accredited through a large neighborhood of either proprietors and clients, a customary needs to be sta ble. this suggests a lifestyles span of at the least a decade. This additionally means that the normal should be basic and versatile adequate to house current in addition to anticipated destiny advancements. 1.1.1 IGES The preliminary improvement of ideas for CAD facts trade is strongly prompted via the U.S. built-in desktop Aided production (ICAM) programme, that handled the advance of equipment for info alternate. In September 1979, a subgroup was once estab lished with participation of the nationwide Bureau of criteria, the final electrical Com pany, and the Boeing corporation. the results of this attempt used to be the preliminary photos alternate Specification (IGES) that used to be released as a NBS document  in 1980.
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Extra info for CAD Data Transfer for Solid Models
User records are not semantically known in the reference schema. They can be accommodated there as a means of storing information that is to be associated with entities, but that is to be interpreted by special programmes. User records may contain data of types PREDEFINED, GEOMETRIC, or references. 1 of CAD-I, while implementing swept volume primitives in processors for BRAV03 and TECHNOVISION. RECORD_TYPE imposes type restrictions on private records. DATA_BASE_BRIDGE allocates remote data bases to the model.
It integrated the specification of curves, surfaces, and solid models. It also contained the first feedback from the interaction with the STEP community. This interaction was quite in favour of the CAD-I proposals as most of the solutions presented by the CAD-I project could be backed up by the demonstration of successful implementation and testing. Most processor development work occurred on this basis. 3 was established in September 1988 and published with 250 pages . 2 as a result of the interaction between the CAD-I implementations for solid model transfer and those for transfer a computer aided analysis models.
INTEGER represents a integer value as an entity. INTEGER_EXPRESSION defines an arithmetic expression from which an integer value is computed. REAL represents a real value as an entity. REAL_EXPRESSION defines an arithmetic expression from which a real value is computed. MACRO represents a macro which may be invoked by the user to generate a geometry model and to store it in his data base. The macro contains a data representation of the algorithm that generates the model. ROUTINE represents a routine, programmed in a programming language and converted to executable form, which may be invoked by the user to generate a geometry model and to store it in his data base.
CAD Data Transfer for Solid Models by I. Bey (auth.), E. G. Schlechtendahl (eds.)