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Item GRAPHIC DISPLAYS IN THE COMPUTER AIDED DESIGN OF LIFT SYSTEMS(The Eurographics Association, 1982) Barney, G.C.; D.S. Greenaway and E.A. WarmanThe sizing of lift systems to meet passenger demands is normally carried out in a quantitative way by calculation. Nothing is done to determine the quality of service provided. This paper describes how a computer aided design suite using discrete simulation techniques coupled to extensive graphic displays overcomes these deficiencies.Item TOWN PLANNING AIDED BY AN INTEGRATED MUNICIPAL LAND INFORMATION SYSTEM(The Eurographics Association, 1981) Eloranta, Kirsi; J. L. EncarnacaoThe purpose of this paper is to describe the results of our recent land information systems research in The Institute of Geodesy at Helsinki University of Technology. Our goal is to make research on municipal systems by building pilot systems and also by studying technical implementation problems on theoretic basis. In this paper one of our pilot systems is described, the one that is designed for town planning applications. Generally the research project could be characterized by the following keywords: use of minicomputers, problem oriented approach, evolutive approach in systems design, applications oriented data base management and integration of urban land information systems.Item 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 FAST ALGORITHM FOR COLOUR REGION SEGMENTATION(The Eurographics Association, 1982) Stark, J.P.W.; Mahdavieh, Y.; Tjahjardi, T.; D.S. Greenaway and E.A. WarmanAn algorithm is described which analyses colour scenes in terms of regions. These regions are defined to have the same 'colour'. In this context the colour of a region is determined by its position in the CIE chromaticity diagram. The procedure outlined reduces the three-dimensional colour cube to a one-dimensional colour grey-scale. This approach significantly reduces the amount of data and also the amount of processing required in colour scene analysis.Item SOME USEFUL BUT RATHER UNUSUAL GRAPHICAL PRIMITIVES(The Eurographics Association, 1981) Magnenat-Thalmann, Nadia; Thalmann, Daniel; Bergeron, Philippe; J. L. EncarnacaoThe MIRALIB library is a powerful graphical library which may be used with MIRA-2D, a graphical PASCAL extension as well as with the standard PASCAL language. MIRALIB includes figure algebra routines, figure measure functions, figure recognition predicates, image transformations as fitting or clearing and animation primitives. The most unusual primitives are presented with the help of a few examples.Item ON CONSTRUCTING INTERACTIVE GRAPHICS SYSTEMS(The Eurographics Association, 1982) Hanusa, Henning; Kuhlmann, Herbert W.; Pfaff, Günther E.; D.S. Greenaway and E.A. WarmanAbstract: A framework for generating a graphics dialogue system dedicated to special application, user, and graphics hardware characteristics is presented. A prerequisite is the design of common dialogue methods and the establishing of a dialogue library. Due to environment dependent parameters a prototype dialogue-subsystem is configured. The evaluation of data being monitored during interactive sessions leads to subsequent re-configuration steps.Item ABSTRACT DATA TYPE BASED PROGRAMMING STYLE AND COMPUTER GRAPHICS(The Eurographics Association, 1981) Giloi, W. K.; J. L. EncarnacaoThe next generation of "intelligent" industrial robots will necessitate off-line programming systems in which generative graphics (picture generation) and cognitive graphics (picture understanding) is combined. This will require programming languages that comprise graphical data types. The classical implementation of a graphical programming system in the form of a procedure package deals with representations of graphical objects and thus does not provide graphical data types. However, modern abstract data type based languages allow graphical data types to be introduced as user-defined abstract data types. The features of such a language, CLU, is discussed, and the implementation of a graphical data type in CLU is illustrated by a simple example.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 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 HagenItem A COMPUTER GRAPHICS PACKAGE FOR TEACHING CRYSTAL MORPHOLOGY(The Eurographics Association, 1982) Angell, Ian O.; Moore, Moreton; D.S. Greenaway and E.A. Warman