Now showing items 21-40 of 40

    • Integrating Inheritance and Composition in an Objective Presentation Model for Multiple Media 

      Took, Roger (Eurographics Association, 1991)
      A formal model is presented which combines, in a single structure called a tangle, the power to express both the composition of aggregate objects, and the selective inheritance of object properties over a number of instances ...
    • MOVE-X: A System for Combining Video Films and Computer Animation 

      Ertl, Gerhard; Müller-Seelich, Heimo; Tabatabai, Behnam (Eurographics Association, 1991)
      The objective of the presented project was to implement a system for the visualization of buildings. The system is used to create movies of buildings and interior rooms before they are built. For a realistic impression of ...
    • Discrepancy as a Quality Measure for Sample Distributions 

      Shirley, Peter (Eurographics Association, 1991)
      Discrepancy, a scalar measure of sample point equidistribution, is discussed in the context of Computer Graphics sampling problems. Several sampling strategies and their discrepancy characteristics are examined. The ...
    • A Testbed for Image Synthesis 

      Trumbore, Ben; Lytle, Wayne; Greenberg, Donald P. (Eurographics Association, 1991)
      Image Synthesis research combines new ideas with existing techniques. A collection of software modules that provide such techniques is extremely useful for simplifying the development process. We describe the design and ...
    • Solid-Interpolating Deformations: Construction and animation of PIPs 

      Kaul, Anil; Rossignac, Jarek (Eurographics Association, 1991)
      Computer programs that simulate the deformations of geometric shapes have played a key role in the increasing popularity of software tools for artistic animation. Previously published techniques for specifying and animating ...
    • Radiosity for Furry Surfaces 

      Chen, Hong; Wu, En-Hua (Eurographics Association, 1991)
      Though radiosity method is an advanced rendering technique of global illumination, it is still not sufficiently to cope with many natural phenonmena such as furry surfaces. The rendering of furry surfaces has been a long ...
    • Variable-Radius Blending by Using Gregory Patches in Geo- metric Modeling 

      Harada, T.; Konnoa, K.; Chiyokura, H. (Eurographics Association, 1991)
      Blending surfaces, which connect two curved surfaces smoothly, often appear in geometric modeling. Many of the blending surfaces are variable-radius blends. Variableradius blending surfaces are very important in the design ...
    • C 2 Gregory patch 

      Miuraa, Kenjiro Takai; Wangb, Kuo-King (Eurographics Association, 1991)
      G² continuity of free-form surfaces is sometimes very important in engineering applications. The conditions for G2 continuity between two Bezier patches has been studied and methods developed to ensure such continuity. ...
    • Time Complexity of Monte Carlo Radiosity 

      Shirley, Peter (Eurographics Association, 1991)
      The time complexity of Monte Carlo radiosity is discussed, and a proof is given that the expected number of rays required to produce a satisfactory radiosity solution for N zones is O(N). A satisfactory solution is defined ...
    • A Symmetrical Input/Output Model 

      Carlsen, Niels Vejrup; Christensen, Niels Jorgen (Eurographics Association, 1991)
      When choosing a graphics system for the run-time support component of a User Interface Management System (UIMS) several problems arise. Existing inputloutput models employed by graphics systems lack support for fine grain ...
    • Computational Physics : A Modeler - Simulator for animated physical Objects 

      Luciani, Annie; Jimenez, Stephane; Florens, Jean Loup; Cadoz, Claude; Raoult, Olivier (Eurographics Association, 1991)
      Physical modeling for animation is now firmly established. The present aim is to design and build a structured and well-defined tool rather than merely specific algorithms to simulate physical knowledge. We will first ...
    • Interactive Conformance Testing for PHIGS 

      Cugini, John V. (Eurographics Association, 1991)
      Conformance testing for the Programmer’s Hierarchical Interactive Graphics System (PHIGS) standard presents certain novel difficulties, especially the indirect effect of many functions, and the inaccessibility to the program ...
    • Tessellation of Curved Surfaces under Highly Varying Transformations 

      Abi-Ezzi, Salim S.; Shirman, Leon A. (Eurographics Association, 1991)
      We pursue the problem of step size determination for tessellating arbitrary degree polynomial and rational Bezier patches, under highly varying modeling and viewing transformations, to within post-viewing size and/or ...
    • Several approaches to implement the merging step of the split and merge region segmentation 

      Popovic, M.; Chantemargue, F.; Canals, R.; Bonton, P. (Eurographics Association, 1991)
      The purpose of this paper is to propose several approaches for the implementation of the merging step of split and merge region segmentation. The splitting step has already been studied and its parallelization has subsequently ...
    • Timewarps: A Temporal Reparameterization Paradigm for Parametric Animation 

      Smith, Jeff; Drewery, Karin (Eurographics Association, 1991)
      The ability to reparameterize the temporal axis in an animated sequence is a powerful and underexplored tool. Timewarps are described as extensions to previous work and the advantages of this tool are outlined. Timewarps ...
    • Animation of Landscapes Using Satellite Imagery 

      Geymayer, Barbara; Prantl, Manfred; Müller-Seelich, Heimo; Tabatabai, Behnam (Eurographics Association, 1991)
      The paper presents methods to animate synthetic landscapes. The modeling of the landscape, the interactive specification of the flight path and the simulation of an explosion are described. The landscape is visualized by ...
    • Fast Rendering of General Ellipses 

      Fellner, Dieter W.; Helmberg, Christoph (Eurographics Association, 1991)
      Even though GKS did not include circles and, in a more general form, ellipses and elliptical arcs in the list of elementary graphics primitives, CGM settled this omission with its standardization in 1987. According to CGM ...
    • A constraint-based UIMS using graph unification 

      Samuel, J. F. (Eurographics Association, 1991)
      This paper describes an experimental UIMS developed to investigate methods of combining and reusing objects within a constraint-based system. A novel approach based on graph-unification facilitated the definition of composite ...
    • Declarative Graphics And Dynamic Interaction 

      Johnson, C.W.; Harrison, M.D. (Eurographics Association, 1991)
      First order logic provides a means of integrating the specification and prototyping of interactive systems. It can describe graphical images in a declarative and order independent manner. It supports the definition of ...
    • Shading with Area Light Sources 

      Tanaka, Toshimitsu; Takahashi, Tokiichiro (Eurographics Association, 1991)
      This paper derives a shading model for area light sources which covers both diffuse and specular reflection. The shading model assumes ideally diffuse polygonal light sources and uses Phong’s reflection model. The model ...