Eurographics Conferences: Recent submissions

Now showing items 1141-1160 of 2886

    • 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 ...

    • 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. ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Delauney Triangulations and the Radiosity Approach 

      Schuierer, Sven (Eurographics Association, 1989)
      The radiosity approach requires the subdivision of complex surfaces into simple components called patches. Since we assume to have constant intensity over a patch, the generation of regular patches is a desirable property ...

    • 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 ...

    • Anti-Aliasing by Successive Steps with a Z-Buffer 

      Ghazanfarpour, D.; Peroche, B. (Eurographics Association, 1989)
      We present a method allowing to solve the three problems arising when a scene is displayed with the z-buffer algorithm. The proposed algorithm only requires one extra memory bit per pixel and delivers good quality images. ...

    • 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 ...

    • 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 ...

    • On Reducing the Phong Shading Method 

      Claussen, Ute (Eurographics Association, 1989)
      Today, the shading method of Phong plays an important role in the design of realtime image generation systems. Often, the model has been used in combination with a color interpolation, suppressing a main property of this ...

    • Algorithms for 2D Line Clipping 

      Skala, Vaclav (Eurographics Association, 1989)
      New algorithms for 2D line clipping against convex, non-convex windows and windows that consist of linear edges and arcs are being presented. Algorithms were derived from the Cohen-Sutherland 's and Liang-Barsky s algorithms. ...

    • Highlight Shading: Lighting and Shading in a PHIGS+/PEX-Environment 

      Poepsel, J.; Hornung, C. (Eurographics Association, 1989)
      Todays graphics standard for the rendering of scenes with illumination and reflection is defined by PHIGS+ . PEX is a proposal to integrate that functionality into the window environment of X. This paper first describes ...

    • 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 ...

    • Visualisation in Astrophysics 

      Ertl, T.; Geyer, F.; Herold, H.; Kraus, U.; Niemeier, R.; Nollert, H.- P.; Rebetzky, A.; Ruder, H.; Zeller, G. (Eurographics Association, 1989)
      This paper reports on progress we have made in modelling cosmic X-ray sources on supercomputers. The results we present are meant to serve as an example for the fact that sophisticated visualization techniques play a crucial ...

    • Visualisation of Digital Terrain Data 

      Thiemann, Rolf; Fischer, Joachim; Haschek, Guido; Kneidl, Gerald (Eurographics Association, 1989)
      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, ...

    • Deformation of Solids with Trivariate B-Splines 

      Griessmair, Josef; Purgathofer, Werner (Eurographics Association, 1989)
      Solid geometric models can be deformed to free-form solids by the use of trivariate B-splines. This paper describes the problems of implementing such transformations for shaded rendering. The surfaces are subdivided into ...

    • A Parallel Image Computer with a Distributed Frame Buffer: System Architecture and Programming 

      Potmesil, Michael; McMillan, Leonard; Hoffert, Eric M.; Inman, Jennifer F.; Farah, Robert L.; Howard, Marc (Eurographics Association, 1989)
      We describe the system architecture and the programming environment of the Pixel Machine - a parallel image computer for 2D and 3D image synthesis and analysis. The architecture of the computer is based on an array of ...