Now showing items 1-20 of 45

    • PRELOG - A SYSTEM FOR PRESENTING AND RENDERING LOGIC SPECIFICATIONS OF INTERACTIVE SYSTEMS 

      Johnson, C.W.; Harrison, M.D. (Eurographics Association, 1990)
      Formal specifications provide the non-specialist with an extremely poor impression of what it would be like to interact with a computer system. Prototypes provide a far better impression of the ‘look and feel’ of possible ...
    • AN APPROACH TO THE FORMAL SPECIFICATION OF THE COMPONENTS OF AN INTERACTION 

      Faconti, Giorgio P.; Paterno, Fabio (Eurographics Association, 1990)
      In this paper we present the preliminary results from a work aiming to the formal specification af a model suitable for the description of interactive graphics program within the framework defined by the Reference Model ...
    • Fast Rendering of Arbitrary Distributed Volume Densities 

      Sakas, Georgios (Eurographics Association, 1990)
      In recent years a number of techniques have been developed for rendering volume effects (haze, fog, smoke, clouds, etc.). These techniques are either time consuming (ray-tracing, radiosity) or do not account for arbitrary ...
    • OPTIMIZATION OF THE BINARY SPACE PARTITION ALGORITHM (BSP) FOR THE VISUALIZATION OF DYNAMIC SCENES 

      Torres, Enric (Eurographics Association, 1990)
      This paper describes an improvement of the generation of BSP trees and its utilization in the visualization of dynamic polyhedral scenes. Dynamic BSP trees, a new six-level structure, are presented. Dynamic BSP trees are ...
    • TRIES: DATA STRUCTURES BASED ON BINARY REPRESENTATION FOR RAY TRACING 

      Thirion, Jean-Philippe (Eurographics Association, 1990)
      Tries are data structures used for multidimensional searching. We introduce an original method to build Tries for a set of convex polyhedra, weshow how Tries can be used for Ray tracing and we compare them with other data ...
    • WSE: An Environment for Exploring Window Strategies 

      Koivunen, Marja-Riitta (Eurographics Association, 1990)
      This paper describes Window Strategies Environment (WSE), which is an environment for exploring different window strategies. It is a tool for developers who want to implement and explore different window strategies easily. ...
    • Hemi-Cube Ray-Tracing: A Method for Generating Soft Shadows 

      Meyer, Urs (Eurographics Association, 1990)
      This paper presents a new ray-tracing technique for generating soft shadows. The technique treats scenes consisting of light sources and opaque objects which are polygons or polyhedra of arbitrary shape and size. To determine ...
    • Shading and Shadowing with Linear Light Sources 

      Poulin, Pierre; Amanatides, John (Eurographics Association, 1990)
      In virtually all rendering systems, linear light sources are modeled with a series of point light sources that require considerable computing resources to produce realistic looking results. A general solution for shading ...
    • AN INTERPOLATION METHOD FOR STOCHASTIC MODELS 

      Ramstein, G. (Eurographics Association, 1990)
      This paper presents a method using stochastic models for the simulation and interpolation of natural phenomena. These models are based on the general concept of random functions with stationary increments, to which the fbm ...
    • END USER PROGRAMMING ENVIRONMENTS : INTERACTIVE PROGRAMMING-ON-EXAMPLE IN CAD PARAMETRIC DESIGN 

      Girard, P.; Pierra, G.; Guittet, L. (Eurographics Association, 1990)
      In recent years, the number of computer end-users who do not know programming has increased rapidly. This new phenomenon has spurred a great deal of research about program design using very different approaches from the ...
    • 3D MODELLING AND MOTION OF DEFORMABLE SOLIDS FROM 2D IMAGES 

      Neveu, Marc; Faudot, Dominique (Eurographics Association, 1990)
      Our work purpose is to elaborate a geometric and motional model for deformable solids, known only by a very small number of general crosssections images. We start from a generic 3D model of the studied solid we distort ...
    • CHARACTERIZATION OF TOPOGRAPHIC SURFACES 

      Falcidieno, Bianca; Spagnuolo, Michela (Eurographics Association, 1990)
      This paper presents a method for extracting and representang features of a topographic surface approximated by triangular tales An algorithm as given which computes characteristic regions (a. e. regions having concave, ...
    • TRIMO A Workstation-Based Interactive System for the Generation, Manipulation, and Display of Surfaces over Arbitrary Topological Meshes 

      Slusallek, Philipp B.; Seidel, Hans-Peter (Eurographics Association, 1990)
      TRIMO has been designed as a workstation-based interactive system for the generation, manipulation, and display of surfaces over arbitrary toplogical meshes. In addition to rational tensor product Bezier and B-spline ...
    • AN INTERACTIVE DEBUGGER FOR PHIGS 

      Howard, T.L.J.; Hewitt, W.T.; Larkin, S. (Eurographics Association, 1990)
      The Programmer’s Hierarchical Interactive Graphics System (PHIGS) is an International Standard for integrating application modelling and interactive computer graphics. With PHIGS, application models are constructed from ...
    • Factoring a Homogeneous Transformation for a more Efficient Graphics Pipeline 

      Abi-Ezzi, Salim S.; Wozny, Michael J. (Eurographics Association, 1990)
      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 ...
    • A PROPOSAL FOR A POSTSCRIPT 3D EXTENSION 

      Cesar, Christian L. (Eurographics Association, 1990)
      A 3D graphics extension to the PostScript language is proposed. The extension maintains the same graphic programming style that characterizes the language's 2D environment. The extensions proposed cover 3D graphics state, ...
    • PRESENTATION OF PRODUCT MODEL DATA -AN INTERFACE BETWEEN GRAPHICS AND CAD- 

      Klement, Kornel (Eurographics Association, 1990)
      The associative visualization of revisable product model data is of great importance for the usefulness and the acceptance of standards in the field of CAD data exchange. The outlines of a separate Presentation module which ...
    • DaScript Plus A PostScript Extension supporting 3D Graphics with 2D Functionality 

      Samara, Veronika; Schaub, Jutta; Noll, Stefan (Eurographics Association, 1990)
      In the world of electronic publishing page description languages describe a very powerful interface between document creation software and raster output devices. 3D graphics systems offer the possibility to give a more or ...
    • Joint Editing with DAPHNE A System integrating CGMs into SGML Documents 

      Scheller, Angela; Fuhrhop, Christian (Eurographics Association, 1990)
      This paper presents DAPHNE, a document processing system for joint editing within the German Research Network DFN. DAPHNE is based on two international standards in the area of document and graphics processing, the Standard ...
    • ADAPTIVE POLYGONIZATION OF IMPLICIT SURFACES USING SIMPLICIAL DECOMPOSITION AND BOUNDARY CONSTRAINTS 

      Velho, Luiz (Eurographics Association, 1990)
      This paper presents a method to generate a polygonal approximation of implicit surfaces. Space partitioning by simplicial decomposition is used to sample the surface, which provides an unambiguous framework for polygon ...