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    IMPROVING COMPUTER GRAPHICS TOOLS FOR ARCHITECTS
    (The Eurographics Association, 1984) Ekeberg, Oerjan; Engblom, Carl-Henrik; Kjelldahl, Lars; Lundequist, Jerker; Thörnblom, Ingvar; K. BO and H.A. TUCKER
    During the last ten years a lot of work has been done in architectural applications using computers and especially computer graphics. It is however obvious that these new tools have not been fully accepted by architects in common. We think that one of the main reasons for this is the poor facilities for the interaction between the user and the machine. In our project at KTH in Stockholm we use modern workstations with bitmapped techniques to study the possibilities to design good interactive facilities. Ideas for interactive techniques are gathered together with architects and are implemented on a Xerox LISP machine. The most interesting and important techniques are studied in experiments that are set up together with behavioural scientists.
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    COMPUTER GRAPHICS DEVELOPMENT IN EUROPE
    (The Eurographics Association, 1984) Marechal, Guy; Matthys, Jan; K. BO and H.A. TUCKER
    Europe is becoming aware that a political determination to collaborate is required, if it wants to attain the position it could claim on the basis of its research achievements. This is especially true in the field of Computer Graphics. The program ESPRIT is hopefully a decisive step in this direction.
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    THE DEVELOPMENT OF COMPUTER GRAPHICS CURRICULA FOR DESIGN EDUCATION
    (The Eurographics Association, 1984) King, Robin G.; K. BO and H.A. TUCKER
    With the imminent availability of low cost, high resolution computer graphics systems suitable for visual and graphic arts applications, design education must now come to terms with radical changes in design methodology and stylistic content. This paper explores some of the more critical problems facing design educators and in particular those which will force significant departures from current curricula. A case study is explored and recommendations given for program design and new teaching strategies.
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    USER INTERFACE: CONCEPTS AND SPECIFICATIONS
    (The Eurographics Association, 1984) Spliid, Axel Monrad; Sorgen, Amos; K. BO and H.A. TUCKER
    A CAD/CAM/CAE system may be very powerful, but its acceptance among a user group depends heavily on its User Interface. It is very important that the User Interface of such a system can easily be adapted to the engineer's way of thinking and working. This paper presents the results of the development made at the Control Engineering Section of the Institute for Product Development at the Technical University of Denmark, in order to reach this goal. Modules which can easily be assembled to fulfil differentuser requirements for interaction with the system were developed. The basic building blocks in the input process - like a key stroke on the key board or a light pen interrupt - are hierarchicallycomposed into tokens and higher syntax constructs. Five basic processes are present at each level in the hierarchy: Prompting, echoing, input interpretation, information transmission to a higher level and error handling. Care was taken to clearly identify different interface levels to device dependent features, leaving the User Interface itself device independent.
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    THE DESIGN OF A USER INTERFACE FOR A CAM APPLICATION
    (The Eurographics Association, 1984) Sauter, Roland; K. BO and H.A. TUCKER
    This paper describes a user interface which has been designed for the rough environment of a workshop floor. It has a strictly hierarchical structure of the commands, but allows a lot of context-free operator's actions and enquiries, which can be activated at any time through the use of universal commands. The user can walk up and down in the dialog, can look at any available data or command, or at the history; he can even look at the user's manual on the screen.
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    A PAINT PROGRAM FOR THE GRAPHIC ARTS IN PRINTING
    (The Eurographics Association, 84) Willis, P J; K. BO and H.A. TUCKER
    There is considerable scope for the application of computer techniques to help the graphic designer working with printed products, provided that pictures of high technical quality result. Described here is the product of the first stage of a research programme aimed at providing computer assisted drawing aids for high quality colour pictures. The product is an interactive paint program. The paper first explains the nature of the application and the hardware available to the author. It then claims that transcription is central to the task of high quality painting. Next there is a description of the facilities available to the interactive user. Finally, a case study of the implementation of one particular command is used to illustrate the general design of the program and to illustrate why this results in a less rigid interaction than in conventional paint programs.
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    AN ANALYTICAL VISIBILITY METHOD FOR DISPLAYING PARAMETRICALLY DEFINED SURFACES
    (The Eurographics Association, 1984) Rehwald, Peter; Hornung, Christoph; K. BO and H.A. TUCKER
    This paper describes an analytical method to determine the visible parts of a Cartesian product surface. The bounds of these visible areas are determined in terms of the (u,v)-parameter-plane. This leads to many advantages over approximating algorithms. The new method allows the calculation and display of only the boundaries and contour curves with high precision. It calculates the critical points of a surface (contours, overlapping contours, penetrations) with machine precision, independent of the resolution of the output device and makes the parallel output on vector- and raster-devices possible. The results of this method are invarying under image-transformations.
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    COMPUTER-AIDED THREE-DIMENSIONAL RECONSTRUCTION FROM SERIAL SECTIONS: A SOFTWARE PACKAGE FOR RECONSTRUCTION AND SELECTIVE IMAGE GENERATION FOR COMPLEX TOPOLOGIES
    (The Eurographics Association, 1984) Huijsmans, D. P.; Lamers, W. H.; Los, J. A.; Smith, J.; Strackee, J.; K. BO and H.A. TUCKER
    To extend computer-aided three-dimensional reconstruction of (microscopic) biological structures to complex topologies, a number of specially developed contour algorithms are employed to generate hidden-line displays of user-specified selections from a dual-access relational database. The database consists of piles of automatically aligned contours from either handtraced or automatically detected surface boundaries in a series of parallel cross-sections that result from the slicing of an embedded, stained biologic structure with alignment references. A video-tape with animation sequences generated with this package will be shown during the conference.
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    STEPS TO EFFECTIVE BUSINESS GRAPHICS
    (The Eurographics Association, 1984) Macllroy, AI; Wyman, Peggy; K. BO and H.A. TUCKER
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    APPLICATION OF COMPUTER-GENERATED ANIMATION IN EUROPEAN SPACE RESEARCH
    (The Eurographics Association, 84) Kristiansen, E.; K. BO and H.A. TUCKER
    In space research, there is often a need to illustrate motion, such as a spacecraft's orbital motion and attitude manoeuvres. This paper presents various types of applications for computer generated animation in space research. Some problem areas are discussed, such as scaling in space and time, conflicts between small and large objects, and problems of representation of slow and fast motion. Finally, a particular project is presented, together with the experience gained.