Issue 3
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Item Factoring a Homogeneous Transformation for a more Efficient Graphics Pipeline(Blackwell Publishing Ltd and the Eurographics Association, 1990) Abi-Ezzi, Salim S.; Wozny, Michael J.We identify an intermediate coordinate system situated between world coordinates and display coordinates, which exhibits unique features for lighting calculations and for clipping in homogeneous coordinates. Our key contribution is an algorithm for extracting such a coordinate system from a homogeneous viewing transformation that relates WC to DC. The algorithm is based on factoring the transformation into a product of a Euclidean factor and a sparse (computationally cheap) but non-Euclidean factor.A particularly strong application of the proposed technique is the graphical processing of curved surface primitives, such as what is needed in the PHIGS PLUS viewing pipeline. Furthermore, in PHIGS PLUS the graphical data is retained by the graphics system, therefore, it is possible to perform the factoring of the viewing transformation at creation time, and to take advantage of this factored form at traversal time.Item COMPUTER GRAPHICS PROFESSIONALS(Blackwell Publishing Ltd and the Eurographics Association, 1990)Item Combining Graphics and Windowing Standards in the XGKS System(Blackwell Publishing Ltd and the Eurographics Association, 1990) Rogers, Greg; Sung, Kelvin; Kubitz, WilliamIn the past few years we have seen the acceptance of standards for both two and three dimensional computer graphics. Also during this time, the workstation community has converged on a common windowing system. This paper discusses the problems encountered in implementing graphics standards such as GKS and PHIGS PLUS within the X Window System environment.Item EDITORIAL(Blackwell Publishing Ltd and the Eurographics Association, 1990) Arnold, DavidItem Book Reviews(Blackwell Publishing Ltd and the Eurographics Association, 1990)Book reviewed in this article:Reviewer: Ralph Martin. University of Wales College of CardiffItem General Assembly of the EUROGRAPHICS Association(Blackwell Publishing Ltd and the Eurographics Association, 1990)Item SIGGRAPH/EUROGRAPHICS Curriculum Review Call for Reviewers(Blackwell Publishing Ltd and the Eurographics Association, 1990)Item Offers to EUROGRAPHICS Members(Blackwell Publishing Ltd and the Eurographics Association, 1990)Item Report on the Fourth Eurographics Workshop on Intelligent CAD(Blackwell Publishing Ltd and the Eurographics Association, 1990) Arbab, FarhadItem Revisions to the EUROGRAPHICS Bye-laws(Blackwell Publishing Ltd and the Eurographics Association, 1990) Vandoni, C.E.; Duce, D.A.Item Doctoral Theses in Computer Graphics(Blackwell Publishing Ltd and the Eurographics Association, 1990) Kjelldahl, LarsItem The Douglas-Peucker Algorithm for Line Simplification: Re-evaluation through Visualization(Blackwell Publishing Ltd and the Eurographics Association, 1990) Visvalingam, M.; Whyatt, J. D.The primary aim of this paper is to illustrate the value of visualization in cartography and to indicate that tools for the generation and manipulation of realistic images are of limited value within this application. This paper demonstrates the value of visualization within one problem in cartography, namely the generalisation of lines. It reports on the evaluation of the Douglas-Peucker algorithm for line simplification. Visualization of the simplification process and of the results suggest that the mathematical measures of performance proposed by some other researchers are inappropriate, misleading and questionable.Item Using GKS Concurrently: a Practical Solution(Blackwell Publishing Ltd and the Eurographics Association, 1990) Flores, J. Zamorano; Costoya, F. Perez; Perez, J. Carretero and Henriquez, L.M. Gomez and Ambite, A. PerezThis paper analyses the use of GKS with concurrent languages, showing the inherent problems that arise when working in a multitasking environment. A theoretical solution and its practical implementation are described.Item Report of the Eurographics UK Conference(Blackwell Publishing Ltd and the Eurographics Association, 1990) Mumford, AnneItem Workshop Report Future Developments in Computer Graphics Teaching Eurographics Workshop - University of Leeds - Easter 1989(Blackwell Publishing Ltd and the Eurographics Association, 1990) Brodlie, K.W.Item Yugraph 90(Blackwell Publishing Ltd and the Eurographics Association, 1990) Duce, D.A.Item Call for Participation: Computer Graphics and Education 91(Blackwell Publishing Ltd and the Eurographics Association, 1990)Item A Browser for Large Directed Graphs(Blackwell Publishing Ltd and the Eurographics Association, 1990) Bovey, J. D.The paper describes an experimental graph browsing tool which provides fast interactive browsing on very large graphs. The particular graph for which the program was developed is based on the distributed tile system of a group of workstations but there is no reason why the same techniques should not be used on graphs from other sources.Item Report on the First Eurographics Workshop on Object-Oriented Graphics(Blackwell Publishing Ltd and the Eurographics Association, 1990) Otten, DaanItem Calendar of Events(Blackwell Publishing Ltd and the Eurographics Association, 1990)