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  • Supporting Graphical Languages with Structure Editors 

    Szwillus, Gerd (Eurographics Association, 1989)
    Graphical editors are used in numerous application fields for purposes like specification, design, modelling, or description of structures of various kinds. These editors handle the graphical representations based on objects ...
  • Visualizing Curvature Discontinuities of Free-Form Surfaces 

    Pottmann, Helmut (Eurographics Association, 1989)
    A new method for the visualization of curvature discontinuities of free-form surfaces is presented. It is based upon an improvement and refinement of the well-known technique of displaying isophotes.
  • Colour Section 

    - (Eurographics Association, 1989)
  • When is a Line a Line? 

    Brodlie, Ken W.; Göbel, Martin; Roberts, Ann; Ziegler, Rolf (Eurographics Association, 1989)
    Conformance testing of graphics systems is a very complex and exhausting task. Years of practice with the GKS testing tools have shown a need for the automatic testing of visual output. Indeed, with regard to graphics ...
  • GEO++ - A System for Both Modelling and Display 

    Wisskirchen, Peter (Eurographics Association, 1989)
    We present a new concept for a graphics system which we call GEO++ . Apart from the manipulation of groups (structures in PHIGS-terminology), GEO++ permits a direct access to the tree structure required for display. With ...
  • 2.5 Dimensional Graphics Systems 

    Herman, Ivan (Eurographics Association, 1989)
    The outline of an extension of traditional 2D graphics systems is given. This extension is aimed at supporting a three dimensional application program, without incorporating full viewing into the general graphics system ...
  • Variations on a Dither Algorithm 

    Pins, Markus; Hild, Hermann (Eurographics Association, 1989)
    Mapping continuous-tone pictures into digital halftone pictures, i.e. 0/1-pictures, for printing purposes is a well explored technique. In this paper, one of these algorithms, the two-dimensional error-diffusion algorithm ...
  • Subdivisions of Surfaces and Generalized Maps 

    Lienhardt, Pascal (Eurographics Association, 1989)
    The modeling of subdivisions of surfaces is of greatest interest in Geometric Modeling (in particular for Boundary Representation) , and many works deal with the definition of models, which enable the representation of ...
  • A Reference Model for the Visualisation of Multi-Dimensional Data 

    Bergeron, R. Daniel; Grinstein, Georges G. (Eurographics Association, 1989)
    This paper presents a reference model for the development of systems for the visualization of multidimensional data. The purpose of the reference model is to build a conceptual basis for thinking about multi-dimensional ...
  • An Analysis of Modeling Clip 

    O Bara, Robert M.; Abi-Ezzi, Salim (Eurographics Association, 1989)
    Modeling clip gives an application the ability to remove sections of an object in order to view internal detail. The clipping volume defied by modeling clip can be concave and disjoint, and is composed of a set of volumes ...
  • Graph Grammars, A New Paradigm for Implementing Visual Languages 

    Goettler, Herbert (Eurographics Association, 1989)
    This paper is a report on an ongoing work which started in 1981 and is aiming at a general method which would help to considerably reduce the time necessary to develop a syntax-directed editor for any given diagram technique. ...
  • The Use of Finite Element Theory for Simulating Object and Human Body Deformations and Contacts 

    Gourret, Jean-Paul; Magnenat-Thalmann, Nadia; Thalmann, Daniel (Eurographics Association, 1989)
    This paper presents a method for combining image synthesis and modeling based on a finite element method (FEM) to get realistic intelligent images. FEM is used for modeling both elastically and plastically deformations of ...
  • Message-Based Object-Oriented Interaction Modeling 

    Breen, David E.; Kühn, Volker (Eurographics Association, 1989)
    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 ...
  • Representing Tolerance Information in Feature-Based Solid Modelling 

    Falcidieno, Bianca; Fossati, Bruno (Eurographics Association, 1989)
    In this paper a system for defining dimensions and tolerances is presented which deals with the geometric representation of the objects in a coherent and compact way. This model is a combination of a hierarchical boundary ...
  • Blending Rational B-Spline Surfaces 

    Bardis, L.; Patrikalakis, N.M. (Eurographics Association, 1989)
    A method for blendin non uniform rational B-spline surface patches, either open or periodic, is developed. he blending surface is expressed in terms of an integral, bicubic B-spline patch. The blend ensures position and ...
  • Hierarchical Texture Synthesis on 3-D Surfaces 

    Bennis, Chakib; Gagalowicz, Andre (Eurographics Association, 1989)
    This paper presents a new method for synthesizing hierarchical textures on 3-D surfaces. This method utilizes both a mapping technique for rendering the macroscopic structure on the surface and a generalization of the ...
  • A Topological Map-Based Kernel for Polyhedron Modelers: Algebraic Specification and Logic Prototyping 

    Dufourd, Jean-Francois (Eurographics Association, 1989)
    This paper deals with the topology of surfaces, in the boundary representation of three dimensional objects. Orientable, not orientable, closed or open surfaces are efficiently described and handled when considered as ...
  • Toward Realistic Formal Specifications for Non-Trivial Graphical Objects 

    Fiume, Eugene (Eurographics Association, 1989)
    Formal specification has long been advocated in programming methodology, and is becoming increasingly popular in computer graphics to characterise the semantics of components of graphics systems. Unfortunately, formal ...
  • GKS, Structures and Formal Specification 

    Duce, D. A. (Eurographics Association, 1989)
    There are now three International Standards for application program interfaces for computer graphics programming, GKS, GKS-3D and PHIGS. In this paper a simplified model GKS-like system is described and a 2D PHIGS-like ...
  • A Model for Description and Synthesis of Heterogeneous Textures 

    Englert, Gabriele; Sakas, Georgios (Eurographics Association, 1989)
    Existing texture models either describe textures as a non-hierarchical surface property (by means of Markov chains, time series and other stochastic methods) or distinguish only between micro and macro textures. Besides ...

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