Volume 02 (1983)

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    EUROGRAPHICS-83 Computer Art Competition
    (Blackwell Publishing Ltd and the Eurographics Association, 1983)
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    Fast Previewing Techniques in Raster Graphics
    (The Eurographics Association, 1983) Jansen, F.W.; Wijk, J.J. van; P.J.W. ten Hagen
    The long processing times inherent in the use of raster graphics techniques for the shading of complex scenes, complicate the design and debugging of a picture. The efficiency of the picture-generating process can, however, be improved by adding several interactive facilities to the system. In particular, fast previewing techniques are valuable for checking the modeling and for getting a good impression in an early stage of the picture-definition process. A discussion of raster graphics system design is followed by examples of fast pre-viewing techniques for the shading and texture mapping of surface models and for the shading of solid models using a raycasting technique.
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    A Delaunay-Based Method for Surface Approximation
    (The Eurographics Association, 1983) Floriani, L.De; Falcidieno, B.; C.Pienovi,; P.J.W. ten Hagen
    This paper describes a method for constructing a surface representation model from a given set of data points.A Triangulated Irregular. Network has been chosen as data structure, thus representing the surface as a set of contiguous non -overlapping and irregurarly shaped triangular facets.The proposed method makes use of a Delaunay triangular grid adapted to non-convex domains. Using only representative subsets of the given set of points, the method allows the construction of approximating surfaces which rest within a predefined tolerance.
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    GKS-300 - PASCAL Implementation of the Graphical Kernel System (GKS) on a Minicomputer Based Graphical Workstation
    (The Eurographics Association, 1983) Schmitgen, Günther; P.J.W. ten Hagen
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    Book Reviews
    (Blackwell Publishing Ltd and the Eurographics Association, 1983)
    Book reviewed in this article:Introduction to the Graphical Kernel System (GKS), F.R.A. Hopgood, D.A. Duce, J.R. Gallop and D.C. SutcliffeDatenbanksystem fur CAD-Arbietsplitze, W.E. FischerSmalltalk 80, the Language and its lmplementntion Addison-Wesley, 1983
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    Non-Rectangular Surface Patches Suitable for Inclusion in a B-Spline Surface
    (The Eurographics Association, 1983) Sabin, M.A.; P.J.W. ten Hagen
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    The New Visual Age: The Influence of Computer Graphics on Art and Society
    (Blackwell Publishing Ltd and the Eurographics Association, 1983) Franke, H. W.
    Only a few years ago it would have seemed ridiculous to discuss the influence of computer graphics on art and society. Although computer generated graphics had already been applied in important areas of science and technology, its influence was not yet felt in the arts or in society at large. Those few who used the computer as an artistic instrument were regarded as outsiders: with their freelance experiments they deviated from the solid ground of strictly defined tasks, but on the other hand found no approval in artistic circles. One of the causes for this lack of approval may have been that they did not submit to the frequently changing fashions which are prevalent in today-s visual arts. Rather, they were, at least in the beginning when searching for motifs, guided by mathematical and geometrical aspects. The fact that they succeeded in opening up a largely unknown realm of graphically attractive forms went unheeded by the critics.
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    A Method for Choosing Tickmarks on a Nonlinear Scale
    (Blackwell Publishing Ltd and the Eurographics Association, 1983) Kjelldahl, L.
    The problem of choosing tickmarks for nonlinear scales is of interest for some kindsof diagrams, e.g., nomograms and contour plots. A method for getting "nice"values at the tickmarks is discussed based on a database of sequences. Each last digit inthe ticknumber has a set of tickmark sequences that may be used from the ticknumber. An implementation to test the method has been made.
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    Geodesic Curves on Patched Polynomial Surfaces
    (Blackwell Publishing Ltd and the Eurographics Association, 1983) Haw, R J; Munchmeyer, F C
    A method is described for tracing geodesic curves across patched surfaces. Two techniques are discussed for constructing the curves - an initial value problem and a boundary value problem. Arc lengths are computed, as well as the enclosed area of an arbitrary region on the surface.
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    Closed 2D Contour Algorithms for 3D Reconstruction
    (The Eurographics Association, 1983) Huijsmans, D. P.; P.J.W. ten Hagen
    In collaboration with the department of Anatomy a software package (FORTRAN 77) for 3D reconstruction of anatomical material is under development. Input material consists of a series of planparallel slices of an embedded specimen. 3D reconstruction of volume segments with closed 3D surface boundaries is achieved by taking closed 2D contour boundaries within each intersecting plane.
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    EDITORIAL
    (Blackwell Publishing Ltd and the Eurographics Association, 1983)
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    Syntactic Methods in Computer Graphics
    (The Eurographics Association, 1983) Slavik, P.; P.J.W. ten Hagen
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    Refinement of the Stress Contour Plots by the Local Interpolations, Extrapolations ans Averaging
    (The Eurographics Association, 1983) Draskovic, Z.; Berkovic, M.; P.J.W. ten Hagen
    The purpose of this paper is an attempt to improve the stress contour plots for the simplest two-dimensional finite elements. The proposed approach is achieved by the use of the simple local interpolations, extrapolations and averaging of the existing stress analysis results. The usual and the proposed, refined procedure are compared for two typical examples.
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    Interactive Graphical Planning
    (The Eurographics Association, 1983) Jackson, Michael J.; Clark, Tony; P.J.W. ten Hagen
    Accurate planning is an essential part of efficient project management, but computer-aided techniques have, in the past, not fulfilled their potential in this important field, This paper describes how interactive graphics techniques have been used to help the planner in the design of his programme of work and in the dissemination of his recommended plan.
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    EUROGRAPHICS General Assembly
    (Blackwell Publishing Ltd and the Eurographics Association, 1983)
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    THE GKS CONTROL BOARD
    (Blackwell Publishing Ltd and the Eurographics Association, 1983) Enderle, G.
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    The GHOST-80 Colour Raster Extensions
    (The Eurographics Association, 1983) Prior, W.A.J.; Sutherland, R.J.; P.J.W. ten Hagen
    The GHOST Graphical Output System has been developed over a long period. The most recent version, GHOST-80 has been enhanced with routines for colour raster displays. The integration of these routines with the existing package is described and their ease of use is emphasised.
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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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    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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    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.