Now showing items 21-40 of 45

    • 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 ...
    • 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 ...
    • 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 ...
    • 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, ...
    • 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 ...
    • 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 ...
    • 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. ...
    • 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 ...
    • 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, ...
    • COLOR IMAGE RECONSTRUCTION FROM NONUNIFORM SPARSE SAMPLES USING A THIN PLATE MODEL 

      Metaxas, Dimitris; Milios, Evangelos (Eurographics Association, 1990)
      In this paper we solve the problem of reconstructing a color image from sparse, noisy, and nonuniformly distributed color measurements. We apply a method for reconstructing a surface from sparse depth measurements to each ...
    • 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, ...
    • 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 ...
    • A shadow algorithm for CSG 

      Jansen, Frederik W.; van der Zalm, Arno N. T. (Eurographics Association, 1990)
      An algorithm is presented for constructing shadow volumes for CSG objects. For each primitive solid, the algorithm calculates a tree of shadow volumes to model the shadows generated by the shadow-generating parts of the ...
    • Cross Scanline Algorithm 

      Tanaka, Toshimitsu; Talcahashi, Tokiichiro (Eurographics Association, 1990)
      This paper proposes a new hidden surface removal algorithm which is based on the scanline algorithm but scans in two directions, horizontally and vertically. Named the cross scanline algorithm, it can efficiently detect ...
    • 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 ...