Browsing EG1990 Proceedings (Technical Papers) by Title

Now showing items 13-32 of 45

    • 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 ...

    • EDEN - AN EDITOR ENVIRONMENT FOR OBJECT- ORIENTED GRAPHICS EDITING 

      Fellner, Dieter W.; Kappe, F. (Eurographics Association, 1990)
      Systems allowing the creation and manipulation of graphical information (so-called Graphic Editors) have become essential in various fields of applications. At the same time the typical user of such a system has changed. ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • HYPERIMAGES - AN ALTERNATIVE TO THE CONVENTIONAL DIGITAL IMAGES 

      Bieri, Hanspeter (Eurographics Association, 1990)
      Hyperimages represent a variation of the conventional digital images which implies pixels of different dimensions within the same image. The extent of a hyperimage is the disjoint union of all pixel extents it contains, ...

    • 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 ...

    • INTERACTIVE RAY-TRACING FOR IMAGE PRODUCTION WITH INCREASING REALISM 

      Sousa, A. Augusto; Costa, Antonio M. C.; Ferreira, Fernando N. (Eurographics Association, 1990)
      The generation of highly realistic images using the conventional Ray-Tracing algorithm, in CAD environments, is totally out of the question if we consider the interactive requirements of most CAD systems. In this paper, ...

    • INTERPOLATING CURVE NETWORKS WITH NEW BLENDING PATCHES 

      Saitoh, Tsuyoshi; Hosaka, Mamoru (Eurographics Association, 1990)
      This paper describes methods of c o n s t r u c t i n g s u r f a c e patches which s a t i s f y independently given boundary conditions on a l l i t s four or t h r e e s i d e s . A patch c o n s i s t s of two p a r t ...

    • 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 ...

    • 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 ...

    • Mathematical Models for Semi-globalized Spectral Synthesis 

      Anjyo, Ken-ichi (Eurographics Association, 1990)
      Semi-globalized spectral synthesis is proposed as a new tool for three-dimensional scene description consisting of many natural objects, such as terrain, sea waves, and clouds. The method is based on the mathematical theory ...

    • AN OBJECT ORIENTED APPROACH TO ENSURE PORTABILITY OF CAD STANDARD PARTS LIBRARIES 

      Pierra, Guy (Eurographics Association, 1990)
      The integration, in CAD systems, of libraries of standard parts is often considered to be one of the key factors for increasing productivity of Computer Aided Design [1] [2] [3]. These libraries must be able to integrate ...

    • On Formulation and Display for Visualizing Features and Evaluating Quality of Free-form Surfaces 

      Higashi, Masatake; Kushimoto, Takuya; Hosaka, Mamoru (Eurographics Association, 1990)
      For evaluating quality of free-form surfaces and visualizing their features, various curves on a surface, which characterize its properties, are defined and their equations are deduced. Newly introduced curves include those ...

    • 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 ...

    • A PIPELINED-PARALLEL ARCHITECTURE FOR 2.5-D BATCH RASTERIZERS 

      Birk, Yitzhak; Mccrossin, lames M . (Eurographics Association, 1990)
      The emergence of application programs that take advantage of highly expressive page description languages has sharply increased the amount of computing required for rasterizing an average page, and single-microprocessor ...

    • 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 ...

    • 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 ...

    • 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, ...