Volume 02 (1983)
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Item A VLSI Implementation of the Graphics Standard GKS(Blackwell Publishing Ltd and the Eurographics Association, 1983) Encarnacao, J L; Lindner, R.; Mehl, M.; Pfaff, G.; Strasser, W.The main advantage when using a standardized graphics system is quite obvious: the application programs become portable. Integrating such a system - and GKS (Graphical Kernel System) is the only one being standardized internationally - into VLSI (Very Large Scale Integration) chips, this graphics system may become an integral part of graphical devices. This guarantees a uniform interface of such devices to GKS applications. Devices of many different kinds will become compatible not only with respect to plugging but even in their logical behaviour, eliminating all device dependencies from the host software.We have started to design the GKS-chip which will be able to be used in a great variety of devices (vector and raster type). The GKS-chip will bring the computational power to support real time picture updates, limited only by the maximally attainable output data rate.Item Elections(Blackwell Publishing Ltd and the Eurographics Association, 1983) Duce, D AItem ANNOUNCING EUROPE-S LARGEST COMPUTER GRAPHICS CONFERENCE(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item An Algorithmic Interpretation of the GKS TEXT Primitive(Blackwell Publishing Ltd and the Eurographics Association, 1983) Brodlie, K W; Pfaff, G.Item Towards GKS Binding to PASCAL(The Eurographics Association, 1983) Antoy, Sergio; Dettori, Giuliana; P.J.W. ten HagenWhen 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.Item A High Level Interface to the Graphical Kernel System - GKS(The Eurographics Association, 1983) Watkins, H.K.; P.J.W. ten HagenA 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.Item Announcement General Assembly of the EUROGRAPHICS Association(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item EUROGRAPHICS The European Association for Computer Graphics(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item The European Association for Computer Graphic(Blackwell Publishing Ltd and the Eurographics Association, 1983) Hopgood, F. R. A.; Ten Hagen, Paul J.W.Item Geodesic Curves on Patched Polynomial Surfaces(Blackwell Publishing Ltd and the Eurographics Association, 1983) Haw, R J; Munchmeyer, F CA 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.Item Closed 2D Contour Algorithms for 3D Reconstruction(The Eurographics Association, 1983) Huijsmans, D. P.; P.J.W. ten HagenIn 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.Item EUROGRAPHICS-83 Computer Art Competition(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item Non-Rectangular Surface Patches Suitable for Inclusion in a B-Spline Surface(The Eurographics Association, 1983) Sabin, M.A.; P.J.W. ten HagenItem 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.Item 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, 1983Item Fast Previewing Techniques in Raster Graphics(The Eurographics Association, 1983) Jansen, F.W.; Wijk, J.J. van; P.J.W. ten HagenThe 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.Item A Delaunay-Based Method for Surface Approximation(The Eurographics Association, 1983) Floriani, L.De; Falcidieno, B.; C.Pienovi,; P.J.W. ten HagenThis 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.Item 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 AItem 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 HagenA 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.Item GKS-Implementations Overview and Inquiry(Blackwell Publishing Ltd and the Eurographics Association, 1983) Enderle, G.