Issue 4

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https://diglib.eg.org/handle/10.2312/22

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    An Editor for Constructing Graphics with TEX
    (Blackwell Publishing Ltd and the Eurographics Association, 1987) Waldschmidt, H.
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    Calendar of Events
    (Blackwell Publishing Ltd and the Eurographics Association, 1987)
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    EUROGRAPHICS General Assembly
    (Blackwell Publishing Ltd and the Eurographics Association, 1987)
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    Evaluation of Standard Graphics Packages
    (Blackwell Publishing Ltd and the Eurographics Association, 1987) Klok, Fopke
    In order to compare the quality of different implementations of GKS, the ISO0 standard for computer graphics, an evaluation method for GKS implementations is presented. It is based upon several groups of criteria. One group of criteria is concerned with performance, by which we understand here the memory requirements and time requirements for programs using GKS functions. A program that measures the performance of GKS packages is presented. Results of this evaluation method with several commercially available GKS implementations are described in summary. A checklist for evaluation of standard graphics packages is added as an appendix.
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    GKS Review Workshop
    (Blackwell Publishing Ltd and the Eurographics Association, 1987)
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    SIGHT-A Dedicated Computer Graphics Machine
    (Blackwell Publishing Ltd and the Eurographics Association, 1987) Naruse, Tadashi; Yoshida, Masaharu; Takahashi, Tokiichiro; Naito, Seiichiro
    The. architecture of, and a performance estimate for, the dedicated graphics processor - SIGHT, a high-speed ray tracing machine, are presented. Ray tracing is a vector calculation in 3-dimensional (3-D) space and each ray to be traced can be calculated independently. The SIGHT is designed so that it speeds up the execution of the ray tracing algorithm at two levels of parallel operations: the pixel-level parallel operation by multiprocessors and the instruction-level parallel operation by the new processing element (PE) architecture. The features of the PE are:
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    Offers to EUROGRAPHICS Members
    (Blackwell Publishing Ltd and the Eurographics Association, 1987)
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    Irregular Polygon Fill Using Contour Encoding
    (Blackwell Publishing Ltd and the Eurographics Association, 1987) Gourret, J.P.; Paille, J.
    A filling algorithm for irregular polygons is described. This algorithm is oriented towards raster graphics and uses image memories as job areas. The algorithm is based on the encoding of polygon boundaries by contour following so that all topologies are successfully processed. Thus, concave or convex polygons, holed or not, including possibly duplicate points can be filled. It is quite robust and easy to implement. It uses systematic encoding without special cases. Only two bits for encoding are needed and, thereby, it is suitable for hardware implementation.This algorithm can be used in many fields such as image synthesis, 3D objects or mathematical surface displays with hidden parts.
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    A View of Eurographics 87
    (Blackwell Publishing Ltd and the Eurographics Association, 1987) Howard, Toby
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    Eurographics 87 Acknowledgements
    (Blackwell Publishing Ltd and the Eurographics Association, 1987)
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    Graphic Acquisition and Retrieval of Stereochemical Information
    (Blackwell Publishing Ltd and the Eurographics Association, 1987) Dubois, J.E.; Cayzergues, P.; Georgoulis, G.
    Stereochemistry concepts deal with situations associated with chiral arrangement of atoms in a molecule. The existence of stereocompounds implies different physical properties associated with local and global structural space dissymetry. A left and right hand relationship is a typical local example of such concepts. In this paper, we show how it is possible to include stereochemistry in a comprehensive system allowing for acquisition, storage and retrieval of chemical information. Special emphasis has been placed on the description of the graphic interface on the level of both data acquisition and retrieval. Various graphic coding procedures associated with stereochemical handling are analysed. A specialized input device, optimized for handling of chemical and structural data in bulk, is presented.
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    Making Drawings Talk: Pictures in Minds and Machines
    (Blackwell Publishing Ltd and the Eurographics Association, 1987) Bijl, Aart
    Interactions between human minds and machine systems will be discussed, drawing on experience of CAD and focusing on modes of expression. Free forms of text and drawings pose deep questions when interpretations have to be"meaningful" to different knowledge representations - especially in loosely defined application fields. What should we expect from technology?
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    An Intersecting Modification to the Bresenham Algorithm
    (Blackwell Publishing Ltd and the Eurographics Association, 1987) Skala, Viclav
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    Eurographics 87 Computer Art Competition
    (Blackwell Publishing Ltd and the Eurographics Association, 1987)
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    Doctoral Theses in Computer Graphics
    (Blackwell Publishing Ltd and the Eurographics Association, 1987)
    A Formal Description Method for User Interfaces, October 1986 by Lynn MarshalOn New Types of Solid Models and their Visualization with Ray Tracing by J.J. van WijkGeometric Mine Modeling: Modeling of Three Dimensional Objects Based on Incomplete Information, 1985 by Olli KaronenIntegration of Free-Form Surfaces and Solid Modelling, 1985 by Per-Olof FjaTlliustroTm
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    EDITORIAL
    (Blackwell Publishing Ltd and the Eurographics Association, 1987) Arnold, David
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    Graphical Analysis of Complex O.D.E. Solutions
    (Blackwell Publishing Ltd and the Eurographics Association, 1987) Richard, F.
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    Logical Input Devices and Interaction
    (Blackwell Publishing Ltd and the Eurographics Association, 1987) van Liere, R.; ten Hagen, P. J. W.
    The logical input device model, as is adopted in the standardized graphics package GKS, has been an accepted basis for producing device-independent graphics systems. However, when used in highly interactive graphical applications, the logical input device model does not provide sufficient support for a number of fundamental issues inherent to interaction. This paper reopens a discussion which questions the functionality provided by the logical input device model when brought in conjunction with interaction. In particular, the logical input device model does not support the notion of input/output symmetry.CR Categories: 1.3.4 [Computer graphics]: Graphics utilities- graphics packages- 1.3.6 [Computer graphics]: Methodology and techniques- device independence, interaction techniques
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    Errata
    (Blackwell Publishing Ltd and the Eurographics Association, 1987) Milanese, V.
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    EUROGRAPHICS Individual Membership Application
    (Blackwell Publishing Ltd and the Eurographics Association, 1987)