Browsing Issue 3 by Title

Now showing items 18-37 of 39

    • A line clipping algorithm and its analysis 

      Krammer, Gergely (Blackwell Science Ltd and the Eurographics Association, 1992)
      One of the classical problems of Computer Graphics: line clipping against a rectangle is revisited. Coordinate raster refinement and some unusual forms of the parametric equation of the line are used to develop formulae ...

    • Modeling with Time and Events in Computer Animation 

      Kalra, Devendra; Barr, Alan H. (Blackwell Science Ltd and the Eurographics Association, 1992)
      In this paper, we present a general, systematic and consistent treatment of time and events for computer animation. We first formalize the concepts of events and create a time primitive called an event unit. We then present ...

    • Modelling the Texture of Paint 

      Cockshott, Tunde; Patterson, John; England, David (Blackwell Science Ltd and the Eurographics Association, 1992)

    • Normal orientation methods for 3D offset curves, sweep surfaces and skinning 

      Siltanen, Pekka; Woodward, Charles (Blackwell Science Ltd and the Eurographics Association, 1992)
      Computing an offset curve to a 3D curve involves the basic problem of normal orientation in space. The same thing is encountered when interpolating surfaces with 3D sweep or skinning methods. Different methods for normal ...

    • An Object-Oriented View of the User Interface 

      Zhou, Tom Z.-Y.; Kubitz, William J. (Blackwell Science Ltd and the Eurographics Association, 1992)
      The object-oriented view of the user interface presented here is a model of object responsibilities-sharing and cooperation for a typical user interface. The model regards the user interface as a three-layer architecture, ...

    • An Open Model for Hypermedia and Its Application to Geographical Information Systems 

      Hall, W.; Simmons, D. (Blackwell Science Ltd and the Eurographics Association, 1992)
      This paper describes the design and implementation of a multimedia information management environment that is based on an open model for hypermedia. The model, known as Microcosm, is currently implemented in Microsoft ...

    • Pandora: An Experiment in Distributed Multimedia 

      King, Tony (Blackwell Science Ltd and the Eurographics Association, 1992)
      An experimental workstation is described which supports digital video and audio in a distributed environment, and which presents this functionality to the user through the medium of a video-extended implementation of the ...

    • The Parametric Differential Method: An Alternative to the Calculation of Form Factors 

      Baranoski, Gladimir V. Guimaraes (Blackwell Science Ltd and the Eurographics Association, 1992)
      The parametric differential method calculates the form factors without using approximations by polygons. Because of this it contributes to the improvement of the realism of the images synthesised through the radiosity ...

    • Radiosity in Flatland 

      Heckhert, Paul S. (Blackwell Science Ltd and the Eurographics Association, 1992)
      The radiosity method for the simulation of interreflection of light between diffuse surfaces is such a common image synthesis technique that its derivation is worthy of study. We here examine the radiosity method in a two ...

    • Realistic Generation and Real Time Animation of Images of the Human Colon 

      Haritsis, Angelo; Gillies, Duncan; Williams, Christopher (Blackwell Science Ltd and the Eurographics Association, 1992)
      A simulator has been built to teach doctors the skill of handling a flexible endoscope for gastrointestinal investigations. Trainees use a dummy endoscope in which the control actions are transduced into voltages and sensed ...

    • Reference, Synthesis and Constraint Satisfaction* 

      Pineda, Luis A. (Blackwell Science Ltd and the Eurographics Association, 1992)
      In this paper we discuss two kinds of constraint satisfaction problems that arise in the context of geometric modelling, In particular in the modification of 2-D wire-frame diagrams that are subject to an arbitrary number ...

    • Rendering NURB Regions For 2D Animation 

      Willis, Philip; Oddy, Robert (Blackwell Science Ltd and the Eurographics Association, 1992)
      We describe an accurate method of rendering by scan-conversion of closed regions bounded by NURBs, with particular comments on its application to computer-based 2D animation. It is shown that the method is fast, analytically ...

    • A Run-Length Slice Line Drawing Algorithm without Division Operations 

      Fung, Khun Yee; Nicholl, Tina M.; Dewdney, A. K. (Blackwell Science Ltd and the Eurographics Association, 1992)

    • A Simple Description of Complex Curves 

      Bouras, A.; Shariat, B.; Vandorpe, D. (Blackwell Science Ltd and the Eurographics Association, 1992)
      In this paper, we propose a method of complex curves description, based on the use of standard primitives (curve arcs), inscribed in including boxes. This method simplifies the creation steps (curves are not defined with ...

    • Simulation of Facial Muscle Actions Based on Rational Free Form Deformations 

      Kalra, Prem; Mangili, Angelo; Thalmann, Nadia Magnenat; Thalmann, Daniel (Blackwell Science Ltd and the Eurographics Association, 1992)
      This paper describes interactive facilities for simulating abstract muscle actions using Rational Free Form Deformations (RFFD). The particular muscle action is simulated as the displacement of the control points of the ...

    • Stochastic Motion-Motion Under the Influence of Wind 

      Shinya, Mikio; Fournier, Alain (Blackwell Science Ltd and the Eurographics Association, 1992)
      Stochastic approaches are very effective for modelling natural phenomena. This paper presents a motion model based on a stochastic process as well as physics, and proposes motion synthesis techniques for stochastic ...

    • SX/Tools - An Open Design Environment for Adaptable Multimedia User Interfaces 

      Kuhme, Thomas; Schneider-Hufschmidt, Matthias (Blackwell Science Ltd and the Eurographics Association, 1992)
      In this paper a brief review of user interface management systems (UIMSs) and their advantages is given. Shortcomings of current UIMSs and open requirements imposed by industrial application areas are outlined. Among the ...

    • Template-Based Volume Viewing 

      Yagel, Roni; Kaufman, Arie (Blackwell Science Ltd and the Eurographics Association, 1992)
      We present an efficient three-phase algorithm for volume viewing that is based on exploiting coherency between rays in parallel projection. The algorithm starts by building a ray-template and determining a special plane ...

    • Two-manifold cell-decomposition of r-sets. 

      Falcidieno, Bianca; Ratto, Ornella (Blackwell Science Ltd and the Eurographics Association, 1992)
      This paper discusses the relationships studied between manifold solids and r-sets by defining an r-set as a decomposition in two-manifold cells. This decomposition is represented as a graph (Two-manifold Cell Decomposition ...

    • A Unified Approach for Physical and Geometric Modeling for Graphics and Animation 

      Essa, Irfan A.; Sclaroff, Stan; Pentland, Alex (Blackwell Science Ltd and the Eurographics Association, 1992)
      We present a unified approach for geometric and physical modeling using implicit functions, for application to graphics and animation. This method extends previously proposed techniques, and allows the standard finite ...