Volume 03 (1984)

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    The Winchester Graphics System: A Technical Overview
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Heywood, T R; Galton, B N; Gillett, J; Morffew, A J; Quarendon, P; Todd, S J P; Wright, W V
    This paper gives a technical overview of the Winchester Graphics System. It concentrates on the software system, and in particular, the use of a relational database (PRTV). The main use of the system is in scientific research and it has been used a great deal in Chemistry, Biophysics and related sciences. However, the facilities are general and the same system is used for quite different applications. such as engineering and archaeology. This database has been found to provide researchers with a powerful flexible tool and has helped the UKSC to provide an environment where new ideas can be proposed and evaluated quickly and easily.
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    An Algorithm for Determining the Intersection of Two Simple Polyhedra
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Szilvasi-Nagy, M.
    An algorithm is presented for the construction of the intersection of two simple possibly non-convex polyhedra. The methods of descriptive geometry are applied, so that this three-dimensional problem can be solved in two dimensions.We have to find all intersections of the edges of each polyhedron with the faces of the other, and these points of intersection can be found in Monge’s model. Projecting both polyhedra on the xy and on the xz coordinate planes we obtain two superimposed maps in both projections. The algorithm to find the intersection of two maps is based upon the Shamos-Hoey, the Bentley-Ottmann and the Nievergelt-Preparata algorithms. The asymptotic time requirement for determining the polygon of intersection of two polyhedra is O((N + S)log N), where N is the sum of the numbers of vertices of the two polyhedra and S is the total number of intersections of all projected edges in the xy-plane (S = O(N2)).
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    EUROGRAPHICS Application Form for Institutional Membership
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Watkins, H.
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    SIGGRAPH ’84
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Hopgood, F.R.A.
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    Letters
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Gangnet, M.
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    Metafile Standards
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Osland, C.D.; Francis, A.H.
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    The Interface of the UIMS to the Application Working Group Report
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Enderle, G.
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    Report on the ANSC X3H3 Meeting at Carmel, Oct lst-5th ’84
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Arnold, D.B.
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    EDITORIAL
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Enderle, Gunter; Duce, David
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    Report on the 7th Meeting of ISO/TC97/SC5/WG2 - Computer Graphics June 1984
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) R Gallop, J
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    A Functional Approach to Picture Manipulation
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Arya, K
    A functional approach is used to investigate the creation and manipulation of pictures as hierarchical entities. A set of useful functions is designed and used in a series of illustrative examples written in the functional programming language HOPE. A functional animation system incorporating these ideas is then discussed.
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    EUROGRAPHICS 2nd UK Conference
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Kidd, Ruth M
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    EUROGRAPHICS General Assembly
    (Blackwell Publishing Ltd and the Eurographics Association, 1984)
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    Proposal for GKS Output Level 3 Segment Hierarchy and Editing
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Steinhart, Jonathan E
    This proposal describes a set of compatible extensions to GKS. These extensions allow for hierarchical segment organization. The ability to edit existing segments is included. The paper is an excerpt from: ISO TC97/SC5/WG2/N309 / ANSI X3H3/84-57R1
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    GKS in Pascal
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Slater, M.
    The design of the Pascal interface to the Graphics Kernel System is discussed and illustrated. The principles underlying the binding are given and examples show how some of the major features of GKS will look in Pascal. The examples cover graphical output, setting primitive representation, graphical input and inquiries.
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    The Specification and Implementation of GKS Application Software in ADA (R)
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Mac an Airchinnigh, M
    One of the most important uses of (interactive) computer graphics is as one of the tools available to a User Interface Management System (UIMS) for a variety of user-computer environments (UCE). Typical UCEs in vogue are Programming Support Environments (PSE), Expert System Builders (ESB), Office Automation systems (OAS). This paper concentrates on the conceptual relationship that exists between the users on the one hand and computer systems on the other. Such relationships are to be seen in the context of specific application domains. The two standards, GKS and Ada, are chosen to be the background against which the argument for a Software Methodology based on the Abstract Data Type approach, is presented. This has significant implications for a GKS binding to Ada and the development of GKS application software written in Ada. A collection of colour models is considered in detail.Ada(R) is a registered trademark of the U.S. Government, Ada Joint Program Office.
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    An Algorithm for Constructing a Quadtree from Polygonal Regions
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Casciani, T.; Falcidieno, B.; Fasciolo, G.; Pienovi, C.
    Quadtrees are a class of hierarchical data structures particularly suitable for the representation of images in a compact form. In this paper a new algorithm is described which builds up the quadtree corresponding to polygonal multiply connected regions starting from their boundary representation.
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    The Eurographics 84 Computer Art and Animation Competition
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Schoenhut, J; Contin, S
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    Computer Graphics Education
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Turk, S
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    Executive Committee Elections 1985
    (Blackwell Publishing Ltd and the Eurographics Association, 1984) Duce, D A