KOSEN 한인과학기술자네트워크

FYI. http://www.minato-ft.co.jp/cadcam/iges-1.html 308 0 Subfigure Definition 子図の図形 402 7 Associativity Instance グループ 404 0 Drawing 図面 408 0 Singular Subfigure Instance 子図の参照 308 0 Subfigure Definition 자도의 도형 402 7 Associativity Instance 그룹 404 0 Drawing 도면 408 0 Singular Subfigure Instance 자도의 참조 http://c4tech.co.kr/manual/basug/basugbt2303.htm Element Type Element number in IGES format Element Type Element number in IGES format null 0 tabulated cylinder 122 circular arc 100 transformation matrix 124 composite curve 102 rational B-spline curve 126 conic arc - ellipse 104 form 1 rational B-spline surface 128 copious data 106 forms 1-3, 11-13, 63 offset curve 130 unbounded plane 108 form 0 offset surface 140 bounded plane 108 form 1 boundary (of skin) 141 * line 110 form 0 curve on a parametric surface 142 * semi-bounded line 110 form 1 bounded surface (of skin) 143 unbounded line 110 form 2 trimmed (parametric) surface 144 parametric spline curve 112 subfigure definition (detail) 308 parametric spline surface 114 color definition 314 point 116 associativity instance (group) 402 forms 1, 7, 14, 15 ruled surface 118 single subfigure instance (ditto) 408 surface of revolution 120 　 　 http://www.eeel.nist.gov/iges/specfigures/ Figure 138. f408x.igs Examples of Subfigure Instances at Various Scales and Orientations created 8/3/1989 size of file = 6.6k http://salesgroup.fujitsu.com/plm/ug/functions/app/xtware/xtware_aply/3d-jiges_table.html http://www.transcendata.com/support/igesworks/doc/v60/users/users-13.htm Appendix A. Introduction to IGES What is IGES? The Initial Graphics Exchange Specification (IGES) is a neutral file format for exchanging data between dissimilar CAD/CAM/CAE systems. You can translate your work into the IGES format and pass that file to someone whose system is unable to directly translate your system's native file format into its own - but can read IGES. In an Ideal World there would be tools that allow you to directly translate files from any source system's format to that of any target system. However, it would take a great deal of effort and money to develop all those specialized translators. Even though IGES adds a step to the translation process, it becomes the only intermediary format your translator needs to deal with. If you and the people you work with use different CAD systems but can read and write IGES all you need is an IGES translator. Ideally, all the time and money saved by not having to write translators to support all the major CAD packages would be spent on making IGES perfect. IGES is an effective general solution, but may sometimes break down. Particularly when exchanging data between systems with fundamentally different approaches to representing data. It may also break down when the IGES translators provided with the source and target system choose to support different subsets of the total IGES specification. The IGES specification defines a structured hierarchical file format and the representation of a variety of entities within the format. The entity set includes geometry annotation structure associativity property attribute entities This entity set is described below: Geometry Entities This entity set represents a set of 3D wireframe, surface, and solid modeling primitives. Typical entities include points, lines, arcs, circles, conics, ruled surfaces, Bspline curves and surfaces, and CSG solids. The geometry entities are used as building blocks to create a meaningful model. Annotation Entities This group represents a set of 2D engineering drafting entities. Typical entities include general notes, linear dimensions, feature control symbols and sectioned areas. The annotation entities are used to further describe the design and/or manufacturing characteristics of the geometric model. Structure Entities These entities are used to create part hierarchy and to view 3D models. Examples are Subfigure Definitions, Views, and Drawings. A Subfigure Definition is an entity that represents a group of geometric and/or annotation entities. A Subfigure Instance is used to instantiate the Subfigure Definition at multiple locations. A View entity defines a viewing orientation of the model. The View entity can specify a scale, rotation, and/or clipping boundary for the model data. A Drawing entity describes the layout of a drawing sheet by describing the relative locations of View entities and annotation entities. The combination of the Drawing and View structures are used to define the presentation of the geometric model in a 2D coordinate system (paper/screen perspective). Associativity Entities These entities are used to logically relate two or more entities. For example, the Network Flow Associativity is used to represent electrical signal connectivity. The Dimensioned Associativity is used to relate model geometry and drawing space annotations. Property Entities This group represents a set of entities that are used to assign nongraphic data to base entities. A base entity is an entity that represents a meaningful feature in the native CAD/CAM system. For example, a Subfigure Definition may be used to represent a bolt. In this case a property entity can be used to assign a part number to the bolt. Attribute Entities The attribute entities are used to assign nongraphic data in exactly the same manner as a property entities do. However, the attribute entities are implemented in such a way that they are more space efficient. Why you Should use IGES Data sharing between engineering disciplines has come to be a necessity. A number of standard formats exist to make this exchange possible. Some of the most popular formats include: Initial Graphics Design Exchange Format (IGES) AutoCAD Data Exchange Format (DXF) Electronic Design Interchange Format (EDIF) Standard for the Exchange of Product Model Data (STEP) VDAFS (a German Surface Data Exchange Format) SET (a French Data Exchange Standard). Each of these formats has strengths in the application areas they support, but the IGES application domain has the largest scope. This fact alone probably makes IGES the general CAD data exchange format of choice. IGES also supports implementor-defined entities and relationships. This makes it possible for two CAD/CAM vendors who want to create a tightly bound translation capability, with enough functional overlap between their systems, to make enhancements to IGES by designing their own extensions. >CAD 에서 IGES 타입인 308/408 에 기술한 subfigure Definition 과 >subfigure Instance 의 의미를 잘 모르겠습니다. > >모델링을 표현하는 타입인것 같은데 구조를 갖고 있는 모델이라는 건 >가요. 인터넷에서 검색해보면 Latex 관련해서만 subfigure 가 나오는 >데 어떻게 이해할 수 있을까요? > > > > > > > >