CAD Data Transfer for Solid Models by I. Bey (auth.), E. G. Schlechtendahl (eds.)

By I. Bey (auth.), E. G. Schlechtendahl (eds.)

Principal authors: U. Kroszynski, B. Palstr9Sm 1.1 The evolution of options and necessities for CAD information trade The CAD/CAM group has witnessed, over the past decade, the looks of a number of requisites in addition to proposals for criteria which both try and hide wider parts or to be extra trustworthy and strong than the others. With the speedy evolution of either and software program, the features provided by means of CAD platforms and CAD dependent software platforms are way more complex than they have been purely ten years in the past, even if they're now according to micro-computers or own comput­ ers. the location with criteria, even if, isn't and can't be so. for you to be trustworthy and authorised by way of a large group of either owners and clients, a regular should be sta­ ble. this suggests a lifestyles span of a minimum of a decade. This additionally means that the normal needs to be normal and versatile sufficient to house current in addition to anticipated destiny advancements. 1.1.1 IGES The preliminary improvement of ideas for CAD info trade is strongly stimulated via the U.S. built-in computing device Aided production (ICAM) programme, that handled the improvement 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 was once the preliminary pictures trade Specification (IGES) that used to be released as a NBS file [61] in 1980.

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Allowed is: • L1NE_SEGMENT_ON_SURFACE • B_SPLlNE_CURVE_ON_SURFACE INTERSECTION_CURVE is a curve generated as the intersection of two surfaces. TRIMMED_CURVE_ON_SURFACE is a trimmed curve on a surface. COMPOSITE_CURVE_ON_SURFACE is a composite curve on a surface. 3. 5 17 Solid models Boundary representations B_REP represents a complete B-rep model. Its topological constituents are: • SHELL • FACE • FACE_SURFACE • LOOP • EDGE_LOOP • EDGE • VERTEX_LOOP • VERTEX EDGE_CURVE is the class of curves that may be used to define the edge geometry.

REF_PART_LIBRARY refers to an entity that is in a library. REF_ANY refers to an entity that may be anywhere. 4 Geometric model entities GEOMETRIC_MODEL is the class of all geometric models comprising: • WIREFRAME_MODEL • SURFACE_MODEL • SOLID_MODEL Placement and instancing GEOMETRIC is the class of all geometric entities. INSTANCE indicates that an instance of a geometric entity is to be placed somewhere in space. ROTATION is the class of all rotation representations. ROT_AXIS rotates around an axis.

The first three views relate to the transport aspect of physical files. The last two views relate to the presentation of the content of the file. Thus, with respect to the ISO model of Open Systems Interconnection the first three views belong to level 4 (transport) while the last two belong to level 6 (presentation). 1 The transport aspect Based upon the experience with the data transfer for CAD and many other applications the CAD' I project decided to define the transport level for the physical file as follows: A CAD-I physical file is a sequence of 8-bit bytes blocked into 80-byte records which in turn are blocked into 800-byte blocks.

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