Volume 02 (1983)
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Item 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 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.Item An Intelligent Graphics Terminal's Intermediate Database(The Eurographics Association, 1983) Rudalics, M.; P.J.W. ten HagenThe Intelligent Graphics Terminal's Intermediate Database (INGRID) handles storage, retrieval and manipulation of the description of graphic items in the memory of an Intelligent Graphics Terminal. INGRID combines on one storage level the concepts of a Workstation Dependent Segment Storage, as described in the Graphical Kernel System (GKS) , and a display list for a workstation providing output of graphic primitives in store and refresh mode.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 Visualizing Inversions in Time with Computer Graphics(The Eurographics Association, 1983) Mezzina, Maria; P.J.W. ten HagenAn example of how computer graphics have been used to visually explore the INVERSION SPACE, and its educational and artistic implications.Item EDITROIAL(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item Graphics Related Activities at NCSDCT, Bombay(Blackwell Publishing Ltd and the Eurographics Association, 1983) Mudur, S PItem Solid Modeling with Parametric Surfaces(The Eurographics Association, 1983) Alander, J.; Mantyla, M.; RANTANEN, T.; P.J.W. ten HagenSolid modeling systems are now entering industrial usage. To guarantee their wide applicability, the capabilities of solid modelers should be enhanced to allow inclusion of free-form surfaces in their geometric models, however. Based on our evolving work, we describe the methodology and some key components of a solid modeler with parametric surface processing capability. Emphasis is put on a clean and extendible design that avoids the arbitrary restrictions which often are present in current systems.Item Executive Committee Meeting 25 April 1983, Amsterdam, The Netherlands(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item CALL FOR PARTICIPATION EUROGRAPHICS WORKING GROUP GRAPHICS PROGRAMMING(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item EUROGRAPHICS(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item SADIST: an Interactive Editor for Structured Analysis(Blackwell Publishing Ltd and the Eurographics Association, 1983) Munro, A T DAn interactive editor for a computer-aided documentation system based on Structured Analysis (SA) is described. The paper investigates the potential offered by computer graphics in the implementation of the editor and discusses the hardware and software support that is required. Interactive enforcement of SA rules and the ability to accept non-deterministic input for modeless editing are identified as key factors.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 Single User Workstations(Blackwell Publishing Ltd and the Eurographics Association, 1983) Hopgood, F R A; Prosser, C.Item Report of EUROGRAPHICS-83 Zagreb, Yugoslavia(Blackwell Publishing Ltd and the Eurographics Association, 1983) Sweeney, Miss A; Watkins, H K.Item 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.Item COMPUTER GRAPHICS FORUM Subject Index to Volume 2(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item The European Association for Computer Graphics(Blackwell Publishing Ltd and the Eurographics Association, 1983)Item 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.Item Minutes of the Executive Board Meeting, In Darmstadt, 1982:12:1.(Blackwell Publishing Ltd and the Eurographics Association, 1983)