Interest in product data exchange and interfaces in the CAD/CAM area is steadi ly growing. The rapidly increasing graphics applications in engineering and sci ence has led to a great variety of heterogeneous hardware and software products. This has become a major obstacle in the progress of systems integration. To improve this situation CAD/CAM users have called for specification and imple mentation of standardized product data interfaces. These needs resulted in the definition of preliminary standards in this area. Since 1975 activities have been concentrated on developing standards for three major areas: - computer graphics, - sculptured surfaces, and - data exchange for engineering drawings. The Graphical Kernel System (GKS) has been accepted as an international standard for graphics programming in 1984, Y14.26M (IGES) was adopted as an American Standard in 1981 and the VDA Surface Interface (VDAFS) has been accepted by the German National Standardization Institute (DIN NAM 96.4). Although considerable progress has been achieved, the complexity of the subject and the dynamics of the CAD/CAM-development still calls for more generality and compatibility of the interfaces. This has resulted in an inter national discussion on further improvements of the standards. The major goal of this book is to bring together the different views and experiences in industry and university in the area of Product Data Interfaces, thereby contributing to the ongoing work in improving the state of the art.
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1 Introduction Reference Models, Interfaces, Integration Issues.- 1.1
Goals in the Application of CAD Interfaces.- 1.2 Interfaces and Data Transfer
Formats in Computer Graphics Systems.- 1.3 CAD/CAM: Integration in the
Automobile Industry.- 1.4 Interfaces for CAD Applications.- 2 Graphics
Systems Graphical Standards GKS.- 2.1 Graphical Standards.- 2.2 GKS and
Intelligent Terminals.- 2.3 Tektronix PLOT 10 GKS Tailored for Customers
Needs.- 2.4 Common Graphics Manager Design Concepts.- 2.5 GKSGRAL
Software and Hardware Realizations of the Graphical Kernel System.- 3 Initial
Graphics Exchange Specifications Implementation, Experience.- 3.1 Product
Data Exchange; Design and Implementation of IGES Processors.- 3.2 Experience
Gained Using the IGES Interface for CAD/CAM Data Transfer.- 4 VDAFS
Functionalities, Approximation Methods, Implementation, Experience.- 4.1
VDAFS A Pragmatic Interface for the Exchange of Sculptured Surface Data.-
4.2 Approximation Methods Used in the Exchange of Geometric Information via
the VDA/VDMA Surface Interface 150.- 4.3 A Tentative Implementation of
VDAFS.- 4.4 Implementation of a VDA Interface in the CAD System STRIM 100.-
4.5 The Implementation of the VDAFS Geometric Data Interface on
Computervisions CDS 4000 CAD/CAM System.- 4.6 Experience with VDAFS.- 5
Specification and Validation.- 5.1 Specification of Interfaces: A Case Study
of Data Exchange Languages.- 5.2 Validation of Graphics Systems.- 5.3 Testing
and Validation of IGES Processors.- 6 Outlook.- 6.1 Progress in the
Development of CAD/CAM Interfaces for Transfer of Product Definition Data.-
Contributors.
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