Now showing items 21-40 of 62

    • A New Approach for the Generation of Circles 

      Hsu, S. Y.; Chow, Louis R.; Liu, H. C. (Blackwell Science Ltd and the Eurographics Association, 1993)
      Two incremental algorithms for drawing circles using short line segments are proposed in this paper. The proposed algorithms can draw manypoints at one time. They use only addition, subtraction, and shift operations except ...
    • A Prototype of a Cooperative Visualization Workplace for the Aerodynamicist 

      Pagendarm, H.-G.; Walter, B. (Blackwell Science Ltd and the Eurographics Association, 1993)
      Several feasibility studies for cooperative visualization were performed based on an existing modular visualization system. Two different architectures for the implementation of a cooperative system were identified, ...
    • Automatic Reconstruction of Buildings from Stereoscopic Image Sequences 

      Koch, Reinhard (Blackwell Science Ltd and the Eurographics Association, 1993)
      A vision-based 3-D scene analysis system is described that is capable to model complex real-world scenes like streets and buildings automatically from stereoscopic image pairs. Input to the system is a sequence of stereoscopic ...
    • Modeling of Skylight and Rendering of Outdoor Scenes 

      Tadamura, Katsumi; Nakamae, Eihachiro; Kaneda, Kazufumi; Baba, Masashi; Yamashita, Hideo and Nishita, Tomoyuki (Blackwell Science Ltd and the Eurographics Association, 1993)
      Photorealistic animated images are extremely effective for pre-evaluating visual impact of city renewal and construction of tall buildings. In order to generate a photorealistic image not only the direct sunlight but also ...
    • GKS-9x: Some Implementation Considerations 

      Damnjanovic, L.B.; Duce, D.A.; Robinson, S.K. (Blackwell Science Ltd and the Eurographics Association, 1993)
      The Graphical Kernel System (GKS) was published as an ISO standard for computer graphics programming in August 1985. GKS is now undergoing revision in ISO/IEC and at the time of writing the text of the Draft International ...
    • Abstract Interaction Objects 

      Duke, D.J.; Harrison, M.D. (Blackwell Science Ltd and the Eurographics Association, 1993)
      The concept of an interactor has been introduced by Faconti and Paterno [6] as an abstraction of an entity in interactive graphics capable of both input and output. However the notion of interaction object need not be ...
    • Storage Support for Multidimensional Discrete Data in Multimedia Databases 

      Furtado, Paula; Teixeira, Jose Carlos (Blackwell Science Ltd and the Eurographics Association, 1993)
      Multidimensional discrete data (MDD) is enormously important for multimedia applications since diverse types of such data are used simultaneously by any multimedia application. However, multidimensional discrete data is ...
    • Quality Control of an Interpolation Method for Discontinuous Parametric Surfaces 

      Seron, F.J.; Torrens, J.J; Magallon, J.A. (Blackwell Science Ltd and the Eurographics Association, 1993)
      In this paper we study a finite element interpolation method for fitting discontinuous parametric surfaces when the data points are the nodes of a curvilinear grid. Quality control of the interpolating surfaces is also ...
    • Nonsplitting Macro Patches for Implicit Cubic Spline Surfaces 

      Guo, B. (Blackwell Science Ltd and the Eurographics Association, 1993)
      Macro patches are important for generating quadric or cubic implicit spline surfaces from the input of a polyhedron. All existing macro patches split the triangular facets of the polyhedron- this paper presents cubic ...
    • A New Radiosity Approach Using Area Sampling for Parametric Patches 

      Nishita, Tomoyuki; Nakamae, Eihachiro (Blackwell Science Ltd and the Eurographics Association, 1993)
      A high precision illumination model is indispensable for lighting simulation and realistic image synthesis. For the purpose of improving realism, research on global illumination has been done, and several papers on radiosity ...
    • Scale-Invariant Minimum-Cost Curves: Fair and Robust Design Implements 

      Moreton, Henry P.; Sequin, Carlo H. (Blackwell Science Ltd and the Eurographics Association, 1993)
      Four functionals for the computation of minimum cost curves are compared. Minimization of these functionals result in the widely studied Minimum Energy Curve (MEC), the recently introduced Minimum Variation Curve (MVC), ...
    • A New Paradigm for Geometric Processing 

      Yamaguchi, Fujio; Niizeki, Masatoshi (Blackwell Science Ltd and the Eurographics Association, 1993)
      A new paradigm for geometric processing is proposed. The paradigm can be featured by the four key phrases: (1) Totally Four Dimensional Homogeneous Processing, (2) 4 ? 4 Matrix Method and 4 ? 4 Determinant Method, (3) ...
    • Introducing blending operations in feature models 

      Laakko, Timo; Mantyla, Martti (Blackwell Science Ltd and the Eurographics Association, 1993)
      We describe the implementation of a blending facility in the context of a feature modelling system where solid and feature-based modelling operations can be utilized in parallel during the design process of a part. The ...
    • A Rendering Algorithm for Discrete Volume Density Objects 

      Blasi, Philippe; Le Saec, Bertrand; Schlick, Christophe (Blackwell Science Ltd and the Eurographics Association, 1993)
      We present a new algorithm for simulating the effect of light travelling through volume objects. Such objects (haze, fog, clouds.) are usually modelized by voxel grids which define their density distribution in a discrete ...
    • Form Factor Calculation: a New Expression with Implementations on a Parallel T.Node Computer 

      Michelin, Sylvain; Maffeis, Gualtiero; Arques, Didier; Grossetie, Jean Claude (Blackwell Science Ltd and the Eurographics Association, 1993)
      The radiosity technique uses the heat transfer theory to define a view-independent illumination model. For complex scenes, calculation of this model is very time-intensive, due largely to the determination of a geometric ...
    • Using Multimedia to Support Cooperative Editing 

      Santos, A.; Tritsch, B. (Blackwell Science Ltd and the Eurographics Association, 1993)
      By Cooperative Editing we mean the coordinated manipulation of information by a group of authors. During the editing process the (co-)authors need to communicate their ideas, drafts and constraints (remotely or face-to-face) ...
    • A Dynamic Gesture Language and Graphical Feedback for Interaction in a 3D User Interface 

      Bordegoni, Monica; Hemmje, Matthias (Blackwell Science Ltd and the Eurographics Association, 1993)
      In user interfaces of modern systems, users get the impression of directly interacting with application objects. In 3D based user interfaces, novel input devices, like hand and force input devices, are being introduced. ...
    • Landscapes Synthesis Achieved through Erosion and Deposition Process Simulation 

      Roudier, P.; Peroche, B.; Perrin, M. (Blackwell Science Ltd and the Eurographics Association, 1993)
      This paper describes an original approach to terrain evolution in landscapes synthesis. In order to create some realistic landforms, we simulate geologically contrasted terrains and apply to them deterministic erosion ...
    • An Object Model for Multimedia Programming 

      Arbab, F.; Herman, I.; Reynolds, G.J. (Blackwell Science Ltd and the Eurographics Association, 1993)
      The development of multimedia applications is a complex task. Much of this complexity stems from requirements associated with programming multiple media objects and the control of dependences and inter-relationships between ...
    • An Integral Geometry Based Method for Fast Form-Factor Computation 

      Sbert, Mateu (Blackwell Science Ltd and the Eurographics Association, 1993)
      Monte Carlo techniques have been widely used in rendering algorithms for local integration. For example, to compute the contribution of a patch to the luminance of another. In the present paper we propose an algorithm based ...