By I. Bey (auth.), E. G. Schlechtendahl (eds.)
Principal authors: U. Kroszynski, B. Palstr9Sm 1.1 The evolution of strategies and necessities for CAD information alternate The CAD/CAM group has witnessed, over the past decade, the looks of numerous requirements in addition to proposals for criteria which both try to conceal wider parts or to be extra trustworthy and sturdy than the others. With the quick evolution of either and software program, the features provided by means of CAD structures and CAD established software structures are way more complex than they have been simply ten years in the past, even if they're now according to micro-computers or own comput ers. the location with criteria, in spite of the fact that, isn't really and can't be so. so as to be trustworthy and authorized through a large neighborhood of either proprietors and clients, a regular needs to be sta ble. this means a lifestyles span of no less than a decade. This additionally signifies that the traditional should be basic and versatile adequate to deal with current in addition to anticipated destiny advancements. 1.1.1 IGES The preliminary improvement of recommendations for CAD facts alternate is strongly stimulated by means of the U.S. built-in desktop Aided production (ICAM) programme, that handled the improvement of equipment for info trade. In September 1979, a subgroup used to be estab lished with participation of the nationwide Bureau of criteria, the overall electrical Com pany, and the Boeing corporation. the results of this attempt was once the preliminary images trade Specification (IGES) that was once released as a NBS record [61] in 1980.
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Example text
The validity and the effect of these operations is governed by the language constructs: • • • • • ATTRIBUTE, PROPERTY, ENTITY, SCOPE, REFERENCE, A more detailled description of this level of semantics is given in [79]. Here, a short summary will be given. 1 Creation of data structure elements Entities may be created in the scope of some other entity provided that they are of a type that may exist in that scope according to the specification. If an entity has to refer to some other entity then the referenced entity has to be created first.
Product Assemblies in the first assembly level scope are to be interpreted as representations different products within a product family. 4. design version Assemblies in the second assembly level scope are to be interpreted as representations of different (optional) design versions of a product. 5. assembly group Assemblies in the next assembly level scope are to be interpreted as representations of different "assemblies'" (in a mechanical engineering sense) that constitute an operational group within the whole product.
The principal requirement is that any processor should either support all of a subset or none of it. In order to provide such a subset structuring in the CAD'I specification four separate categories of capabilities were defined with a number of levels in each one: 1. 2. 3. 4. uctures (la)' capabilities for parametric models and macros (Ip)' capabilities for references (I r ). The geometric modelling levels Two-dimensional wireframes On this level, no entities of type SOLID_MODEL, SURFACE, and D3 are available.