Volume 02 (1983)

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    A New General Purpose Method for Large Volume Production of Contour Charts
    (Blackwell Publishing Ltd and the Eurographics Association, 1983) Cockrell, P R
    Contour (iso-line) maps are used extensively by the Meteorological Office for both routine and research tasks. The techniques employed in a new FORTRAN subroutine (CMAP) for drawing such maps are described. The algorithm employed is raster based, suited to both scalar and vector processors and inherently device independent. In addition some normally cpu intensive operations such as contour shading, chart masking (eg. with respect togeographical areas) and isometric projections are natural extensions of the method requiring comparatively little cpu time.
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    EUROGRAPHICS The European Association for Computer Graphics
    (Blackwell Publishing Ltd and the Eurographics Association, 1983)
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    On Developing a GKS Driver Architecture for Raster Workstations
    (The Eurographics Association, 1983) Rix, Joachim; P.J.W. ten Hagen
    The use of raster graphics devices needs adapting to graphics applications. The first graphics standard, the Graphics Kernel System GKS, defines a logical interface on an application and device independent level. The workstation driver maps the logical GKS functions to device functions. First some special raster device facilities are outlined and then it is shown how to use them within the driver. To reduce the amount of driver implementations a common driver concept is sought here, especially for raster devices.
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    Report on the EEC Workshop on Certification of Graphics Software - Rixensart, Belgium October 1982
    (Blackwell Publishing Ltd and the Eurographics Association, 1983) Brodlie, K.W; Pfaff, G.E.
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    Set Operations of GWB
    (Blackwell Publishing Ltd and the Eurographics Association, 1983) Mantyla, M.
    A set operation algorithm that can be used to unite, intersect, or subtract solids with each other is an essential part of any solid modelling system. The problem is, however, difficult to solve while maintaining the well-formedness of the underlying solid representations. The Geometric Workbench, an experimental solid modeller constructed by the author, uses so-called Euler operators in its set operation algorithm to solve the problem of integrity. This leads to a robust algorithm with a simple overall structure and a clear separation between geometric and topological steps.
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    Report of EUROGRAPHICS-83 Zagreb, Yugoslavia
    (Blackwell Publishing Ltd and the Eurographics Association, 1983) Sweeney, Miss A; Watkins, H K.
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    Interactive Computer Graphics Applied to Chemistry: Experiences and New Developments
    (Blackwell Publishing Ltd and the Eurographics Association, 1983) Combremont, J-J; Roch, M.; Weber, J.
    This paper is essentially a progress report on three years of effort in computer graphics applied to chemistry. The major technical and human problems encountered when running our facility and integrating it into a chemistry department are described. Then progress of our research project, which is developing application programs in several areas of computer graphics applied to chemical education and research, is reviewed. Recent developments in the field of the representation of dynamic processes in molecules and illustrating some basic concepts of reaction mechanisms in organic chemistry are presented, and the important role of graphics in depicting adequately 3D reaction paths is stressed. Finally, some technical problems arising when using the calligraphic system as an audio-visual tool for teaching chemistry are discussed and some possible solutions are presented.
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    Syntactic Methods in Computer Graphics
    (The Eurographics Association, 1983) Slavik, P.; P.J.W. ten Hagen
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    The European Association for Computer Graphics
    (Blackwell Publishing Ltd and the Eurographics Association, 1983)
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    ANNOUNCING EUROPE-S LARGEST COMPUTER GRAPHICS CONFERENCE
    (Blackwell Publishing Ltd and the Eurographics Association, 1983)
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    An Algorithmic Interpretation of the GKS TEXT Primitive
    (Blackwell Publishing Ltd and the Eurographics Association, 1983) Brodlie, K W; Pfaff, G.
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    Towards GKS Binding to PASCAL
    (The Eurographics Association, 1983) Antoy, Sergio; Dettori, Giuliana; P.J.W. ten Hagen
    When binding GKS to the Pascal programming language some problems arise which are not trivial, Problems related to the use of a library, to the passing of array parameters to procedures and to the definition of suitable types for GKS data must be carefully discussed, since each of these does not have a unique solution, A proposal for solving the above problems is presented in this paper.
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    A High Level Interface to the Graphical Kernel System - GKS
    (The Eurographics Association, 1983) Watkins, H.K.; P.J.W. ten Hagen
    A Graphical Package is described with particular reference to the petroleum industry. One of its design aims is that it should act as a user interface to GKS and be as user friendly as possible. As a further design aim, it has to be capable of implementation as a stand-alone graphics package in situations where GKS is not. available. The implications of these design aims are outlined.
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    Announcement General Assembly of the EUROGRAPHICS Association
    (Blackwell Publishing Ltd and the Eurographics Association, 1983)
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    Implementation and Comparison of Different Presentation Layer Codings for Efficient Transfer of GKS Metafiles
    (Blackwell Publishing Ltd and the Eurographics Association, 1983) Duce, Dr D A
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    Fast Access to Archival Information Stored on Optical Memory Discs
    (The Eurographics Association, 1983) Bittner, H.; Krömker, D.; Lenzer, R.; Olsowski, H.D.; P.J.W. ten Hagen
    A database processor based on a multi-microprocessor system managing archival data was developed for the use in local area networks. To grant fast and easy access from office workstations to heterogeneous information stored on optical memory discs, a new strategy of storing data and handling user requests was designed.
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    GKS-Implementations Overview and Inquiry
    (Blackwell Publishing Ltd and the Eurographics Association, 1983) Enderle, G.
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    A Geometric Data Manager
    (The Eurographics Association, 1983) Tikkanen, M.; Mantyla, M.; Tamminen, M.; P.J.W. ten Hagen
    GWB/DMS is the data management subsystem of GWB, the Geometric Work-Bench. I t has been designed specifically for three-dimensional computeraided design applications. As the data definition and manipulation take place with extensions of high-level language constructs, GWB/DMS offers a direct migration from an independent "in-core" application to one using a database. Besides, the user can define additional access paths using geometric or conventional indices. The interactive nature of design is taken into account by including a simple transaction control mechanism. Transparency in ordinary programming and efficiency are the main design criteria of GWB/DMS. Its novelties are: 1) geometric indices facilitating access by location, 2) address calculation as the main access method and 3) tools for controlling the "physical closeness" of database objects.
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    XGKS - A Multitask Implementation of GKS
    (The Eurographics Association, 1983) Herman, I.; T.Tolnay-Knefely,; Vincze, A.; P.J.W. ten Hagen
    A multitask design for GKS is presented, a realization aiming small computers and intelligent graphic hardware.
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    High Level Language Support for 3-Dimensional Graphics
    (The Eurographics Association, 1983) Duhovnik, Joze; Kimura, Fumihiko; Sata, Toshio; P.J.W. ten Hagen
    In the paper the design process is analysed and a new model of the design process which is usefull in CAD is explained. At working a construction with the computer we have to consider the function and form. The function defines the capacity of the construction and the usefulness dependet on the connection machine-nature. With the form we define the possibility of manufacturing and usefulness dependet on the connection man-machine, For a successful working of the function and the form we use geometrical modelling and word processing, The interaction between man-computer can the most easily be done with sketching (form) and speech (words). In the paper the data input with sketching is explained using keyboard instead of speech. In the appendix an example of working the construction by our method is presented.