Browsing Volume 11 (1992) by Title

Now showing items 1-20 of 61

    • Accurate Image Generation and Interactive Image Editing with the A-buffer 

      Lau, Wing Hung; Wiseman, Neil (Blackwell Science Ltd and the Eurographics Association, 1992)
      The A-buffer suggested by Carpenter [2] is a hidden surface removal method which deals with arbitrary overlapping edges in a pixel. In this paper, we suggest a way of increasing the subpixel resolution by storing the bitmask ...

    • 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 ...

    • Adaptive Sampling of Area Light Sources in Ray Tracing Including Diffuse Interreflection 

      Kok, Arjan J. F.; Jansen, Frederik W. (Blackwell Science Ltd and the Eurographics Association, 1992)
      Ray tracing algorithms that sample both the light received directly from light sources and the light received indirectly by diffuse reflection from other patches, can accurately render the global illumination in a scene ...

    • Affine Texture Mapping and Antialiasing Using Integer Arithmetic 

      Nehlig, P.; Ghazanfarpour, D. (Blackwell Science Ltd and the Eurographics Association, 1992)
      Texture mapping techniques are very useful for generating more realistic images. However, texture compression, generally induced by geometric transformations, is at the origin of aliasing artifacts especially the ...

    • Area Sampling Buffer: Tracing Rays with Z-Buffer Hardware 

      Sung, Kelvin (Blackwell Science Ltd and the Eurographics Association, 1992)
      An algorithm that allows the use of z-buffer hardware in assisting area sampling for a ray tracing style renderer is described. The implementation issues involved in discretizing the sampling area and light source area are ...

    • A CAD System for Color Design of a Car 

      Oshima, Tetsuya; Yuasa, Shinji; Sakanoshita, Ken-ichi; Ogata, Yoshinori (Blackwell Science Ltd and the Eurographics Association, 1992)
      We have developed a color CAD system which enables a color designer to evaluate and create body colors of a car on a graphic display and put this system into practical use. The system has three features- generating realistic ...

    • Combined Direct and Inverse Kinematic Control for Articulated Figure Motion Editing 

      Boulic, Ronan; Thalmann, Daniel (Blackwell Science Ltd and the Eurographics Association, 1992)
      A new approach for the animation of articulated figures is presented. We propose a system of articulated motion design which offers a full combination of both direct and inverse kinematic control of the joint parameters. ...

    • Composing Hierarchically Structured Images 

      Patterson, John W.; Cockton, Gilbert (Blackwell Science Ltd and the Eurographics Association, 1992)
      This paper begins by examining the classical raster-based composition model, establishing its weakness, and developing a new composition algebra based on line drawing. It then examines the role of composition in the ...

    • 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 ...

    • Computing Dynamic Changes to BSP Trees 

      Chrysanthou, Y.; Slater, M. (Blackwell Science Ltd and the Eurographics Association, 1992)
      This paper investigates a new method for dynamically changing Binary Space Partition (BSP) trees. A BSP tree representation of a 3D polygonal scene provides an ideal data structure for rapidly performing the hidden surface ...

    • Consistent Schemes for Addressing Surfaces when Ray Tracing Transparent CSG Objects 

      Gervautz, Michael (Blackwell Science Ltd and the Eurographics Association, 1992)
      Constructive Solid Geometry (CSG) defines the shape of objects, i.e. the inside and the outside regions of objects, but it does not define the material properties of the space in the interior of objects. The definition is ...

    • A Cooperative Architecture for Hypermedia Editing - CoMEdiA 

      Santos, Adelino (Blackwell Science Ltd and the Eurographics Association, 1992)
      CoMEdiA is a cooperative hypermedia editing prototype, which enables co-authors to cooperatively produce hypermedia documents. It allows co-authors to communicate their ideas, drafts, guidelines, constraints, and annotations ...

    • A Development Environment for Constructing Graph-Based Editing Tools 

      Chen, M.; Townsend, P.; Wang, C.Y. (Blackwell Science Ltd and the Eurographics Association, 1992)
      Scientists and engineers use numerous kinds of graph notations to model various objects in the real world and their relationships in an abstract pictorial form. However, developing a specific graph editing tool for each ...

    • An Efficient Adaptive Algorithm for Constructing the Convex Differences Tree of a Simple Polygon 

      Rappoport, Ari (Blackwell Science Ltd and the Eurographics Association, 1992)
      The convex differences tree (CDT) representation of a simple polygon is useful in computer graphics, computer vision, computer aided design and robotics. The root of the tree contains the convex hull of the polygon and ...

    • Equidistant Smoothing of Polyhedra with Arbitrary Topologies 

      Ma, Lizhuang; Liang, Youdong; Peng, Qunsheng (Blackwell Science Ltd and the Eurographics Association, 1992)
      Smoothing of polyhedron with arbitrary topology is an important issue in CAGD and CAD/CAM, but so far it is deemed to be difficult to smooth the complex corners of a polyhedron. In this paper, the concept of distance ...

    • 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 ...

    • Formal Specification in the Revision of GKS: An Illustrative Example 

      Duce, D.A.; Damnjanovic, L.B. (Blackwell Science Ltd and the Eurographics Association, 1992)
      The first ISO/IEC standard for computer graphics, the Graphical Kernel System (GKS) was published in August 1985. In accordance with ISO/IEC procedures, GKS is now being reviewed and revised. This paper describes how formal ...

    • 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) ...

    • Fractals and Solid Modeling 

      Groller, Eduard (Blackwell Science Ltd and the Eurographics Association, 1992)
      Trying to combine fractal geometry and solid modeling seems to be a contradiction in itself, In this paper a new type of 3D objects is presented that accomplishes this combination in a specific way. Objects with a fractal ...

    • 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 ...