Browsing EG1990 Proceedings (Technical Papers) by Issue Date

Now showing items 21-40 of 45

    • RENDERING MIRAGES AND OTHER ATMOSPHERIC PHENOMENA 

      Berger, Marc; Levit, Nancy; Trout, Terry (Eurographics Association, 1990)
      The past few years have seen some very impressive results in rendering natural phenomena. This paper addresses the problem of how to model and render optical illusions brought about by atmospheric refraction. Refraction ...

    • A Stochastic Functional Approach for Terrain Modeling 

      Dong, Jun-Cai; Peng, Qun-Sheng; Liang, You-Dong (Eurographics Association, 1990)
      A new functional modeling approach - -functional modeling, is presented to depict various classes of natural terrain. While this approach possesses the functions of several previous methods, it does not suffer the drawbacks ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • The Architecture of a Prototype System for Drawing Data Structures 

      Ding, Chen; Mateti, Prabhaker (Eurographics Association, 1990)
      Automatic drawing of aesthetically pleasing data structure diagrams is a challenging problem which has attracted much research attention. In building such a system, we are confronted with four basic problems: (1) proper ...

    • 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. ...

    • 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 ...

    • Some Possible Applications of CORDIC Processors in Computer Graphics 

      Kocsis, F.; Böhme, J.F. (Eurographics Association, 1990)
      Some application possibilities of an ASIC-type processing element, the CORDIC processor, in computer graphics are discussed. CORDIC-based solutions are derived for some basic computer geometry computations: conversion ...

    • 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 ...

    • Tightly-Coupled Multiprocessing for a Global Illumination Algorithm 

      Drettakis, George; Fiume, Eugene; Fournier, Alain (Eurographics Association, 1990)
      A prevailing trend in computer graphics is the demand for increasingly realistic global illumination models and algorithms. Despite the fact that the computational power of uniprocessors is increasing, it is clear that ...

    • A Constraint-Based Figure-Maker 

      Kalra, Devendra; Barr, Alan H. (Eurographics Association, 1990)
      In this paper, we describe a new kind of constraint-based figure-maker for parametrically defined curves. Figures are made by defining objects and imposing constraints on their geometric behavior. We present a formulation ...

    • 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, ...

    • 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, ...

    • RECONSTRUCTION OF A BOUNDARY REPRESENTATION MODEL FROM THREE ORTHOGRAPHIC PROJECTIONS: A GEOMETRICAL APPROACH 

      Müller, A.; Richter, D. (Eurographics Association, 1990)
      A method is presented for creating a boundary representation model from engineering projections. Although the topic of this reconstruction method has been studied for a few years the fundamentals of reconstruction are ...

    • 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 ...

    • THREE-DIMENSIONAL TEXTURING USING LATTICES 

      Lewis, Robert R. (Eurographics Association, 1990)
      This paper describes a way to perform realistic three-dimensional texturing of ray-traced objects with irregular surfaces. Such texturing has teen done in the past with texture mapping, particle systems, or volumetric ...

    • 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, ...