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Titlebook: Specification of a CAD * I Neutral File for CAD Geometry; Wireframes, Surfaces E. G. Schlechtendahl Book 1988Latest edition ECSC - EEC - EA

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书目名称Specification of a CAD * I Neutral File for CAD Geometry
副标题Wireframes, Surfaces
编辑E. G. Schlechtendahl
视频video
丛书名称Research Reports Esprit
图书封面Titlebook: Specification of a CAD * I Neutral File for CAD Geometry; Wireframes, Surfaces E. G. Schlechtendahl Book 1988Latest edition ECSC - EEC - EA
描述ESPRIT Project 322, "CAD Interfaces", has been established to define the most important interfaces in CAD/CAM systems for data exchange, data base, finite element analysis, experimental analysis, and advanced modeling. The definitions of these interfaces are being elaborated in harmony with international standardization efforts in this field. One principal goal of the project is to develop techniques for the exchange of CAD information between CAD systems, and from the CAD domain to CAA (Computer Aided Analysis) and CAM (Computer Aided Manufacturing). This volume presents a proposal for a neutral file format for CAD data: curves, surfaces, and solids. The specification is based on a reference schema for CAD data bases and is defined informally with respect to its semantics and formally with respect to its syntax. This volume is a revised edition of "Specification of a CAD*I Neutral File for Solids" Version 3.2. The revision reflects the enhancements which result from the implementation of communication processors in eight different CAD systems and from the practical exchange of solid models between these systems. Due to the close interaction between the CAD*I project and the coming
出版日期Book 1988Latest edition
关键词CAD; CAM; computer-aided design (CAD); computer-aided manufacturing (CAM); data exchange; design; interfac
版次3
doihttps://doi.org/10.1007/978-3-642-83622-0
isbn_softcover978-3-540-50392-7
isbn_ebook978-3-642-83622-0
copyrightECSC - EEC - EAEC, Brussels - Luxembourg 1988
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The High Level Data Specification Language HDSLs). Besides, certain T-specific properties (T-Axioms) Are valid for these constansts (semantic of T). For example, the type NATURAL defines the set N=(0, 1, 2, 3, 4, 5 ...) of NATURAL constants, where the relation 2=Suc(Suc(0)) is one of the T-Axioms (Suc denotes the successor function /Suc(X):=X+1).
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IntroductionThe purpose of this paper is to document the results of Working Group 1 (wireframes), Working Group 2(solids), and Working Group 3 (surfaces) of ESPRIT project 322 CAD*I (CAD Interface). The goal of these working groups is:
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ApproachThe purpose of this chapter is to provide an overview of the needs and requirements, the environment, and assumptions used in the development of this specification.
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Basic PrinciplesThis chapter describes the overall concepts underlying the specification of a neutral file for exchange of CAD models between CAD systems or a CAD system and other application areas.
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The CAD*I Reference Model SpecificationThis specification is set up such that for each entity, property, or attribute we define in sequence
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The Physical LayerThe physical layer of the CAD*I neutral file for solids describes how the CAD system data structures are mapped onto a sequential file. There are several levels of regarding the same sequential file:
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State ListsAll state list are divided into three sections:
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