Browsing Issue 3 by Title

Now showing items 1-20 of 39

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • The Graphical Translation of English Text into Signed English in the Hand Sign Translator System 

      Holden, E.J.; Roy, G.G. (Blackwell Science Ltd and the Eurographics Association, 1992)
      Signed English is a manual interpretation of English using fingerspelling and signs. A prototype of the Hand Sign Translator (HST) system was developed to graphically translate English into Signed English, using two-handed ...

    • HAGI, a High-level Application/Graphics Interface 

      Hsu, Y. H.; Kuo, Y. S. (Blackwell Science Ltd and the Eurographics Association, 1992)
      HAGI is an object-oriented graphics system developed on top of the X window system. In addition to providing facilities that structured graphics systems such as GKS usually have, HAGI supports a high- level graphics paradigm ...

    • The Input Model of Standard Graphics Systems Revisited by Formal Specification 

      Faconti, Giorgio P.; Zani, Nicola; Paterno , Fabio (Blackwell Science Ltd and the Eurographics Association, 1992)
      This paper describes the specification of an input model for graphics systems. The initial aim of the work reported in this paper was to revise the input model adopted by graphics standards by means of formal specification ...

    • Interactive Shape Control of Interpolating B-splines 

      Krokos, M. A.; Slater, M. (Blackwell Science Ltd and the Eurographics Association, 1992)
      This paper presents a new methodfor providing interactive shape control of interpolating B-splines. The CAD designer can directly interact with geometric entities defined on the B-spline at any interpolated data point- ...

    • 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)