Now showing items 1-20 of 42

    • A VLSI Chip for Ray Tracing Bicubic Patches 

      Bouatouch, Kadi; Saouter, Yannick; Candela, Jean Charles (Eurographics Association, 1989)
      This paper deals with the integration of a VLSI chip dedicated to ray tracing bicubic patches. A recursive subdivision algorithm is embedded in this chip. The recursion stops when the termination conditions are met. A ...
    • 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 ...
    • Accelerated Radiosity Method for Complex Environments 

      Xu, Hau; Peng, Qun-Sheng; Liang, You-Dong (Eurographics Association, 1989)
      As form-factor calculation costs about 90% of the computing time when applying radiosity approach for realistic image synthesis, it is of great significance to reduce the required computation, An accelerated radiosity ...
    • 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 ...
    • 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 ...
    • Colour Section 

      - (Eurographics Association, 1989)
    • Two Object-Oriented Models to Design Graphical User Interfaces 

      Hübner, Wolfgang; Gomes, Mario Rui (Eurographics Association, 1989)
      Object-oriented concepts are well-suited to deal with the characteristics of user interfaces. Up to now several attempts to integrate the object-oriented paradigm in user interface models were evolved and led to distinctive ...
    • The Structure of Tube - A Tool for Implementing Advanced User Interfaces 

      Hill, Ralph D.; Herrmann, Marc (Eurographics Association, 1989)
      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 ...
    • 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 ...
    • Components, Frameworks and GKS Input 

      Duce, D. A.; Ten Hagen, P.J.W.; Van Liere, R. (Eurographics Association, 1989)
      This paper was inspired by the Components/ Frameworks approach to a Reference Model for computer graphics, currently under discussion in the ISO computer graphics subject committee. The paper shows how a formal description ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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.
    • 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 ...
    • 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 ...
    • 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 ...
    • Adding Parallelism in Object Space to the Rendering Pipeline 

      Chapman, Paul A.; Lewis, Eric (Eurographics Association, 1989)
      This paper analyses the problem of adding parallelism to the rendering pipeline and discusses the reasons for advocating an object-space partition. Consideration of the methods of work distribution and the rendering ...
    • On the Software Structure of User Interface Management Systems 

      Burgstaller, Johann; Grollmann, Joachim; Kapsner, Franz (Eurographics Association, 1989)
      Specific systems for the development of user interfaces (Uls) are used today for coping with the increasing problems of human-computer communication. Some of those systems are based on well-defined models for humancomputer ...