Volume 02 (1983)
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Item An Algebraic Approach to the Standardization and the Certification of Graphics Software(Blackwell Publishing Ltd and the Eurographics Association, 1983) Gnatz, R.Item An Algorithmic Interpretation of the GKS TEXT Primitive(Blackwell Publishing Ltd and the Eurographics Association, 1983) Brodlie, K W; Pfaff, G.Item Announcement General Assembly of the EUROGRAPHICS Association(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item ANNOUNCING EUROPE-S LARGEST COMPUTER GRAPHICS CONFERENCE(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item Automatic Contouring of Faulted Seismic Data Sets(Blackwell Publishing Ltd and the Eurographics Association, 1983) McCullagh, M JThe theoretical basis for two alternative methods of structuring and then contouring 2D and 3D seismic data with faults is described. Both rely on triangulation systems, but one is more suitable for small memory computers, and the other for large memory machines.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 CAD in the Design of Railway-Highway Intersection Safety Equipment and Railway Station Safety Equipment(The Eurographics Association, 1983) Vilfan, B.; Kolar, R.; Toni, M.; Marusic, M.; Mahnic, V.; P.J.W. ten HagenWe describe a software package for the automation of design activities and the automatic production of design documentation. The package is currently beeing used by a consulting organisation in the design of railway -highway intersection safety equipment. The package contains a text processor, a graphic module for the production of engineering drawings, as well as application programs geared to the specific design activities undertaken. All programs in the package utilize a simple data base.Item CALL FOR PARTICIPATION EUROGRAPHICS WORKING GROUP GRAPHICS PROGRAMMING(Blackwell Publishing Ltd and the Eurographics Association, 1983)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 Computer Graphic Presentation of Road Data(The Eurographics Association, 1983) Koren, Hans; Holbaek-Hanssen, Erik; Tjugen, Olav H.; Wiborg, Trond; P.J.W. ten HagenThis paper presents a system for plotting traffic accidents and other data related to roads, on computer drawn maps. A method for simultaneous presentation of many different aspects of the road is also described.Item COMPUTER GRAPHICS FORUM Author Index to Volume 2(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item COMPUTER GRAPHICS FORUM Author Index to Volume 2(Blackwell Publishing Ltd and the Eurographics Association, 1983) Enderle, G.Item COMPUTER GRAPHICS FORUM Subject Index to Volume 2(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item Contribution to Methodic in CAD(The Eurographics Association, 1983) Duhovnik, J.; P.J.W. ten HagenIn 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.Item Decision Support Systems - The Significance of Hybrid Communication Facilities for Operations Research Consultancy(The Eurographics Association, 1983) Gels, Martin; P.J.W. ten HagenIn this paper the significance of suitable combinations of analogue and digital communication facilities in the design and implementation of Decision Support Systems (DSS) will be discussed within the context of practical Operations Research consultancy. It will be pointed out that the individual user's cognitive style and knowledge base play an important role in the design process. Therefore a user-oriented design, based on prototypes will be proposed. For the Operations Research consultant -in the role of both user and designerthe use of hybrid communication facilities is significant if he is not only interested in building models but also implementing them. The design of a DSS for Box-Jenkins time-series modelling will be used as a practical illustration.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 Depth Sorting by Windowing(The Eurographics Association, 1983) Gangnet, Michel; P.J.W. ten HagenIn this paper we present the first version of a new algorithm for hidden-surface and hidden-line elimination which applies primarily to the generation of indoor perspective views of simple building models. The algorithm is very efficient and though being an object space algorithm its run-time depends only on the complexity of the generated picture. The algorithm is recursive and uses extensively the coherence given by the adjacencies of the rooms within a building. Extensions to more complex models are considered.Item The Development of Programs for the Processing of Parametric Curves(Blackwell Publishing Ltd and the Eurographics Association, 1983) Koparkar, P A; Mudur, S PThis paper presents the development of a suite of programs for the processing of parametrically defined curves in two and three dimensions. The programs are presented in Dijkstra-s non-deterministic guarded command notation. The development of the proof of correctness for the programs is also described. Three typical curve processing tasks, such as drawing, curve path following and intersection detection, are described.The algorithms used in these programs are all based on the "divide and conquer (subdivision)" paradigm. Deviation from linearity and Euclidean bounds are two curve shape properties that are used in many of the curve processing tasks. We present fast methods of computing these properties from the algebraic representation of the curve. In particular the paper considers the cubic and the rational quadratic forms of representation.Item DisArray: A 16x16 RasterOp Processor(The Eurographics Association, 1983) Page, Ian; P.J.W. ten HagenRasterOp is a powerful primitive operation for raster graphics. To improve the execution rate of this operation, a machine with a set of 256 1-bit processors organised as a 16x16 array has been constructed. This machine has twodimensional bitmaps as its lowest-level data objects and consequently can manipulate them faster than a conventional (one-dimensional) Von-Neumann machine. Further work is outlined to improve the architecture still further and to integrate the array into a powerful single-user workstation.Item EDITORIAL(Blackwell Publishing Ltd and the Eurographics Association, 1983)