Volume 08 (1989)

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    Photosimulation: Interreflection with Arbitrary Reflectance Models and Illumination
    (Blackwell Publishing Ltd and the Eurographics Association, 1989) Neumann, Laszlo; Neumann, Attila
    Methods for realistic image synthesis are described. Exact mathematical establishment of reflectance models is presented, together with the development of feasible reflectance models meeting the energy balance. A new bidirectional reflectance type, separable reflectance, is introduced. Necessary and sufficient conditions for the iterative solution of the linear equation system of interreflection are presented. Lastly, a new method of inserting numerically defined objects into real optical surroundings is described.
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    Two Parallel Methods for Polygon Clipping
    (Blackwell Publishing Ltd and the Eurographics Association, 1989) Theoharis, Theoharis; Page, Ian
    A control parallel and a novel data parallel implementation of the Sutherland-Hodgman polygon clipping algorithm are presented. The two implementations are based on the INMOS transputer and the AMT Distributed Array Processor respectively- both of these machines are general purpose parallel processors. Performance Figures are reported and implications for further work are discussed.
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    Call for Participation in the EUROGRAPHICS WORKING GROUP on COMPUTER GRAPHICS HARDWARE
    (Blackwell Publishing Ltd and the Eurographics Association, 1989)
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    A Transputer Network for Fast Operations on Digitised Images
    (Blackwell Publishing Ltd and the Eurographics Association, 1989) Arabnia, H.R.; Oliver, M.A.
    Algorithms for the translation and scaling of a digitised image are described. The algorithms have been designed to work on a transputer network which has a simple topology. This transputer network was originally proposed for the arbitrary rotation operation on digitised images1. The data structure used to represent the image is closely related to mnlength encoding. Both operations can be performed in real time on non trivial images.
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    Calendar of Events
    (Blackwell Publishing Ltd and the Eurographics Association, 1989)
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    A Parallel HW/SW Environment for Image Synthesis
    (Blackwell Publishing Ltd and the Eurographics Association, 1989) Paoluzzi, A.; Rosina, M.; Scopigno, R.
    AbstractIn designing graphical workstations for high-level performance presentations of graphical models, the main goal nowadays is to perform some effective real-time traversal and rendering of data. In this paper we present a reference model of parallel processing for graphics, taking into account the main aspects of colour rendering of solid hierarchical shapes- i.e., traversal of structures, hidden surfaces removal, shadow identification and light models. In particular, a parallel design of the main graphical algorithms is presented. Three abstract machines are proposed, designed respectively for data structure traversing, for depth ordering and shadows computation and finally for shape merging and screen processing. Such abstract machines, internally parallel, may be combined in various ways to define different physical architectures.CR Categories and Subject Descriptors: C.1.2 [Multiple Data Stream Architectures] MIMD Processors, Parallel Processors- 1.3.2 [Computer Graphics] Graphics Systems- 1.3.3 [Computer Graphics] Picture Generation -Display Algorithms, Viewing Algorithms- 1.3.7 [Computer Graphics] Three Dimensional Graphics and Realism - Colour, Shading, Shadowing, Visible Line/Surface I Algorithms.
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    Message-Based Object-Oriented Interaction Modeling
    (Eurographics Association, 1989) Breen, David E.; Kühn, Volker
    This paper describes a message-based object-oriented tool for exploring mathematically-based interactions which produce complex motions for computer animation. The tool has been implemented as an object in the object-oriented computer animation system The Clockworks. It supports the definition of complex interactions between geometric objects through the specification of messages to the interacting objects. Our approach is general, flexible and powerful. The tool itself is not hardcoded to a particular application. It simply sends the messages specified by the user. Messages are specified as strings which may be stored, modified and interpreted. Since the tool is part of The Clockworks it may utilize many of the powerful features of the system, including data structuring, mathematical, geometric modeling, and rendering objects. The tool has been used to explore a general spring and mass model, and the response of objects in a vector field.
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    Book Reviews
    (Blackwell Publishing Ltd and the Eurographics Association, 1989)
    Book reviewed in this article:Title: Image Synthesis - Elementary Algorithms Author: Gerard Hegron Translation (by D. Beeson) of: Synthese d Image: Algorithmes ElementairesCurves and Surfaces in Computer Aided Geometric Design Author: F. Yamaguchi
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    Fourth Eurographics Workshop on Graphics Hardware
    (Blackwell Publishing Ltd and the Eurographics Association, 1989)
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    The Structure of Tube - A Tool for Implementing Advanced User Interfaces
    (Eurographics Association, 1989) Hill, Ralph D.; Herrmann, Marc
    Good user interfaces are very costly to implement and maintain. As user interfaces become more advanced, moving to various forms of direct manipulation, they become even more expensive and difficult to implement. In the recent past, many user interface management systems and related tools for the rapid development of user interfaces have been developed. Some have been successful at reducing interface development costs for some styles of interface, but none fully address the requirements of advanced direct manipulation interfaces. We claim this is because they are founded on basic models and components that work only for simpler interaction styles. We present Tube, a tool for the rapid development of advanced direct manipulation user interfaces, describe its structure, and show how it differs from, and is better than, traditional structures.
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    Yet another Remark on the Modelling Clip Problem
    (Blackwell Publishing Ltd and the Eurographics Association, 1989) Zachrisen, Morten
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    Developing an Animated Local Network Simulator
    (Blackwell Publishing Ltd and the Eurographics Association, 1989) Perez-Cazares, J.-R.; Rannou, R.
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    The CGM Today and Tomorrow
    (Blackwell Publishing Ltd and the Eurographics Association, 1989) Mumford, A.M.
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    Report of the Third International Conference on Computer Graphics June 22-24, 1988, Dubrovnik, Yugoslavia
    (Blackwell Publishing Ltd and the Eurographics Association, 1989) Suzjevic, V.
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    COMPUTER GRAPHICS PROFESSIONALS
    (Blackwell Publishing Ltd and the Eurographics Association, 1989)
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    Visualisation of Digital Terrain Data
    (Eurographics Association, 1989) Thiemann, Rolf; Fischer, Joachim; Haschek, Guido; Kneidl, Gerald
    Visualisation technology has found practical application in the field of terrain data processing. A raster data base (RDB-) concept will be introduced, i.e. a multi-dimensional concept of terrain data using elevation data, description data and/or aerial image or satellite data. Other data sources in raster or vector form may also be considered. Methods of 2- and 3-D-imaging of terrain data are pre- sented. Two-dimensional presentation will include grey- and colorcoding of different RDB layers. Techniques for superimposing two datasets are shown using relief data as one source. Color-coding, color-space transformation or a slide-effect process will be used for superimposition. The mapping of aerial image or satellite data onto the relief data will be achieved by known texture-map algorithms. The overlay technique is used for superimposing raster with vector data from geographic data bases. For superimposition, the geometry of the two datasets must not be different. Many applications need the generation of perspective views of the terrain data. For the generation a terrainraytracer will be introduced. Color impression again will be achieved by texture-mapping. Fore- and background can be handled separately. All algorithms presented are implemented in the GELA software.
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    Offers to EUROGRAPHICS Members
    (Blackwell Publishing Ltd and the Eurographics Association, 1989)
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    Colour Section
    (Eurographics Association, 1989) -
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    Offers to EUROGRAPHICS Members
    (Blackwell Publishing Ltd and the Eurographics Association, 1989)
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    Polygon Triangulation Algorithm as a Powerful Core Processor of PLAN-I
    (Blackwell Publishing Ltd and the Eurographics Association, 1989) Chen, Xiangping; Ying, Daoning
    A concise, complete and reliable algorithm for triangulating an arbitrary polygon is presented as a powerful core processor of PLAN-I (Production Layout Automation Nucleus) system1. A polygon with inner loops is converted into a non-self-intersecting polygon (NIP) through adding Bridge Edges . A triangular splitting algorithm for NIP is described in detail and successfully implemented. The program is about 300 lines in FORTRAN-77. Sweeping and local operations with respect to the triangular-faceted boundary representation are designed with the algorithm to improve functions of solid modeling in PLAN-I. The algorithm of triangulation can also be applied to Boolean operations and other issues.