Volume 11 (1992): Recent submissions

Now showing items 41-60 of 61

    • 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 ...

    • An adaptive Discretization Method For Radiosity 

      Languenou, Eric; Bouatouch, Kadi; Tellier, Pierre (Blackwell Science Ltd and the Eurographics Association, 1992)
      When using radiosiiy, the visual quality of the rendered images strongly depends on the method employed for discretizing the scene into patches. A too fine discretization may give rise to artifacts, while with a coarse ...

    • Fast Generation and Surface Structuring Methods for Terrain and Other Natural Phenomena 

      Koh, Eng-Kiat; Hearn, D. D. (Blackwell Science Ltd and the Eurographics Association, 1992)
      Fractal geometry has proven to be a powerful tool for modeling natural phenomena. Using discrete approximations to fractional Brownian motion over a finite grid plane, computer graphics terrain-rendering algorithms are ...

    • 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 ...

    • The Visualization Input Pipeline - Enabling Semantic Interaction in Scientific Visualization 

      Felger, W.; Schroder, F. (Blackwell Science Ltd and the Eurographics Association, 1992)
      Scientific Visualization systems are primarily output-oriented, Users can specify and change parameters that are controlling the visualization process, which will result in different data representations or images respectively. ...

    • 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 ...

    • A Functional Approach to the Visual Simulation of Gaseous Turbulence 

      Sakas, Georgios; Westermann, Rudiger (Blackwell Science Ltd and the Eurographics Association, 1992)
      This paper presents a functional method for the visual simulation of 2-D or 3-D turbulent gaseous motion by using time-varying fractals. The used function incorporates results from the"spectral theory of turbulence", thereby ...

    • 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 ...

    • 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 ...

    • Ray Coherence Between a Sphere and a Convex Polyhedron 

      Horvath, Tamas; Marton, Gabor; Risztics, Peter; Szirmay-Kalos, Laszlo (Blackwell Science Ltd and the Eurographics Association, 1992)
      Using the two ray coherence theorems of Ohta and Maekawa the computation time of ray tracing algorithms for scenes of spheres and convex polyhedra can be reduced considerably. This paper presents further theorems which, ...

    • Integer de Casteljau Algorithm for Rasterizing NURBS Curves 

      Anantakrishnan, Narayanan; Piegl, Les A. (Blackwell Science Ltd and the Eurographics Association, 1992)
      An integer version of the well-known de Casteljau algorithm of NURBS curves is presented here. The algorithm is used to render NURBS curves of any degree on a raster device by turning on pixels that are closest to the ...

    • A Statistical Comparison of Two Hidden Surface Techniques: the Scan-line and Z-buffer Algorithms 

      Slater, Mel; Drake, Kieron; Davison, Allan; Kordakis, Emmanouell and Billyard, Adam and Miranda, Eliot (Blackwell Science Ltd and the Eurographics Association, 1992)
      This paper compares two image space hidden surface removal algorithms for polygonal scenes. These are the z-buffer and scan-line algorithms. There is first an overview of each algorithm, followed by a simulation experiment, ...

    • PHIFI: A PHIGS Interactive System for the Visualization of Scalar and Vector Fields 

      Ascani, Fabrizio; Moltedo, Laura (Blackwell Science Ltd and the Eurographics Association, 1992)
      This paper describes the characteristics of PHIFI, an interactive system for the visualization of scalar and vector fields. PHIFI has been developed at the IAC where applications of the system have also been investigated.

    • User Interface Management Systems for Engineering Applications 

      Sastry, Lakshmi (Blackwell Science Ltd and the Eurographics Association, 1992)
      Essential features of a User Interface Management System (UIMS) from the perspective of engineering applications user interface development are described. Three commercially available UIMS are validated against this set ...

    • Survey of Continuities of Curves and Surfaces 

      Veltkamp, Remco C. (Blackwell Science Ltd and the Eurographics Association, 1992)
      This survey presents an overview to various types of continuity of curves and surfaces, in particular parametric (Cn), visual or geometric (Cn, Gn), Frenet frame (Fn), and tangent surface continuity (Tn), and discusses the ...

    • The Fractal Nature of an Ecological Model 

      Bennan, Wang; Yin, Shi (Blackwell Science Ltd and the Eurographics Association, 1992)
      With the help of computer graphics, the chaotic behaviour of an ecological model in the complex plane has been investigated. Convergence maps that show multi-fractal characteristics (science) and beautiful patterns (art) ...

    • A Computer Model For Pinscreen Simulation: A New Animation Paradigm 

      Lopes, Pedro Faria; Gomes, Mario Rui (Blackwell Science Ltd and the Eurographics Association, 1992)
      Actual computer image and motion synthesis paradigms are presented in order to introduce a new computer animation paradigm that simulates the traditional pinscreen animation technique. Pinscreen is a very particular and ...

    • Geometric and Group-theoretic Methods for Computer Graphic Studies of Islamic Symmetric Patterns 

      Abas, S. J.; Salman, A. (Blackwell Science Ltd and the Eurographics Association, 1992)
      Over the last several years the authors have used computer graphics to generate, study and analyze more than 300 Islamic geometrical repeat patterns. These patterns offer a rich source for exploitation by artists and are ...

    • Ray Tracing and Graphics Standards 

      Urban, B.; Haberstroh, T. (Blackwell Science Ltd and the Eurographics Association, 1992)
      Existing standards for three-dimensional graphic representations are unable to produce any realistically shaded images (except PHIGS PLUS, which provides discrete shading only). Ray Tracing or Radiosity are not taken into ...

    • A Graphic Programming Environment Based on KADMOS 

      Dulli, Susi; Milanese, Vitaliano (Blackwell Science Ltd and the Eurographics Association, 1992)
      In this paper the design and development of a graphic programming system to be relied on KA?MO? are described. The system architecture upresented together with the functionality of construction and manipulation of the ...