Browsing EG1991 by Issue Date

Now showing items 1-20 of 40

    • Combining Volume Rendering with Line and Surface Rendering 

      Frühauf, Martin (Eurographics Association, 1991)
      Volume data is discrete sampled data in the three-dimensional space. Volume rendering is defined as volume visualization directly from volume primitives and not via surface primitives. Geometric objects are represented as ...

    • 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 ...

    • Configurable Representations in Feature-based Modelling 

      Falcidieno, B.; Giannini, F.; Porzia, C.; Spagnuolo, M. (Eurographics Association, 1991)
      A double description is proposed for the representation of a feature-based model which supports the distinction between form and functionality. This description consists of a primary representation in terms of geometric ...

    • Continuation Methods for Approximating Isovalued Complex Surfaces 

      Zahlten, Cornelia; Jürgens, Hartmut (Eurographics Association, 1991)
      Basically there are two different approaches for rendering isovalued surfaces in 3D space: projection methods and surface reconstruction. We are discussing two algorithms of the second kind. Both use continuation methods ...

    • A Testbed for Architectural Modeling 

      Hall, Roy; Bussan, Mimi; Georgiades, Priamos; Greenberg, Donald P. (Eurographics Association, 1991)
      This paper describes the philosophy and implementation of a modeling system that is easy to use yet addresses some of the difficulties of design. It does this by supporting concurrent schematic and geometric representations, ...

    • 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. ...

    • 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 ...

    • 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 ...

    • Using temporal and spatial coherence for accelerating the calculation of animation sequences 

      Gröller, Eduard; Purgathofer, Werner (Eurographics Association, 1991)
      Ray tracing is a well known technique for generating realistic images. One of the major drawbacks of this approach are the extensive computational requirements for image calculation. When generating animation sequences ...

    • Validity Issues for Modular Boundary Models 

      Bruzzone, Elisabetta; De Floriani, Leila (Eurographics Association, 1991)
      Modular boundary models are a class of solid models which describe a solid object as a collection of face-abutting object parts, called components. The Face-to-Face Composition (FFC) model is a specific model of this class, ...

    • 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 ...

    • 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 ...

    • Constructive Page Description Opening Up the Prepress World 

      Samara, Veronika; Wiedling, Hans-Peter (Eurographics Association, 1991)
      Constructive Page Description (CPD) is an overall approach allowing different kinds of data to be exchanged between a variety of systems and manipulated in arbitrary system environments. Fully changeable pages, which keep ...

    • 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 ...

    • Low Sampling Densities using a psychovisual approach 

      Bouville, Christian; Tellier, Pierre; Bouatouch, Kadi (Eurographics Association, 1991)
      It has long been observed that the keenness of sight is lower for diagonal directions than for horizontal or vertical ones. This anisotropy of the human eye response can be exploited by using a non-orthogonal sampling ...

    • Interrogation of Offsets of Polynomial Surface Patches 

      Vafiadou, Maria - Eleni; Patrikalakis, Nicholas M. (Eurographics Association, 1991)
      This paper presents an algorithm for computing the intersection of the offset (or parallel) surface of a polynomial surface patch ( rogenitor) of arbitrary degree, with a straight line. The rogenitor patch is expressed in ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...