Browsing Volume 12 (1993) by Issue Date

Now showing items 1-20 of 62

    • ANIMA: An Interactive Tool for Scientific Data Animation 

      Moltedo, Laura; Morigi, Serena (Blackwell Science Ltd and the Eurographics Association, 1993)
      This paper describes an animation interactive system that produces image sequences used to study the numerical results of scientific simulations. The fundamental goal of the system is to provide an easy method for observing ...

    • A Fractal Method for Digital Elevation Model Construction and its Application to a Mountain Region 

      Brivio, Pietro Alessandro; Marini, Daniele (Blackwell Science Ltd and the Eurographics Association, 1993)
      This paper presents and discusses the results of a methodology for the construction of Digital Elevation Models (DEM), based on mathematical principles of fractal geometry. Classical approaches to DEM are founded on numerical ...

    • Graphic Objects: A Mathematical Abstract Model for Computer Graphics 

      Torres, J.C.; Clares, B. (Blackwell Science Ltd and the Eurographics Association, 1993)
      This paper defines an abstract mathematical model for graphic systems which incorporates modelling operations. The model is based on the"graphic object" concept. A graphic object is an abstraction of a graphic entity. ...

    • The ARGOSI Classification Scheme for Graphics and Networking Applications 

      Sutcliffe, D.C.; Gallop, J.R.; Maybury, R.; Day, R.A.; Duce?, D.A.; Reynolds?, G.J. (Blackwell Science Ltd and the Eurographics Association, 1993)
      ARGOSI is a project concerned with the relationship between standards for graphics and networking, as rejected in its full title: Applications Related Graphics and OSI Standards Integration. It is a collaborative project ...

    • The Method of Dynamic Palette Construction in Realistic Visualization Systems 

      Voloboj, Aleksej G. (Blackwell Science Ltd and the Eurographics Association, 1993)
      The paper describes the colour approximation problem and the method of dynamic palette construction is suggested for its solution. The method uses the graphic display palette based on the computed true colour of the ...

    • A Multiprocessor Implementation of Radiosity 

      Ng, Adelene; Slater, Mel (Blackwell Science Ltd and the Eurographics Association, 1993)
      This paper describes a multi-processor implementation of form factor computation in the radiosity method. Form factors are computed using the ray casting method and the algorithm is enhanced with Binary Space Partition ...

    • The Generation of Circular Arcs on Hexagonal Grids 

      Yong-Kui, Liu (Blackwell Science Ltd and the Eurographics Association, 1993)
      The best disposition of a discrete set of points on the plane can be reached if the points are on a hexagonal grid. This paper describes two algorithms for circular arc mesh point selection on hexagonal grids. They find ...

    • The Generation of Straight Lines on Hexagonal Grids 

      Yong-Kui, Liu (Blackwell Science Ltd and the Eurographics Association, 1993)
      The best disposition of a discrete set of points on the plane can be reached if the points are on a hexagonal grid. This paper describes an algorithm for the generation of straight lines on hexagonal grids. It uses only ...

    • A Survey of 3D Solid Reconstruction from 2D Projection Line Drawings 

      Wang, Weidong; Grinstein, Georges G. (Blackwell Science Ltd and the Eurographics Association, 1993)
      The reconstruction of a 3D object from its 2D projection(s) and its corresponding problem of 3D object recognition are two of the important research areas in the field of computer vision and artificial intelligence. ...

    • Pictorial Editing by Shape Matching Techniques 

      Ventura, A. Della; Ongaro, P.; Schettini, R. (Blackwell Science Ltd and the Eurographics Association, 1993)
      A number ofpainting and retouching packages operate much like the artist s traditional canvas andpalette, with electronic toolsfunctioning like their studio counterparts. These programs, while offering an ample set of tools ...

    • The Potential Equation and Importance in Illumination Computations 

      Pattanaik, S. N.; Mudur, S. P. (Blackwell Science Ltd and the Eurographics Association, 1993)
      An equation adjoint to the luminance equation for describing the global illumination can be formulated using the notion of a surface potential to illuminate the region of interest. This adjoint equation which we shall call ...

    • A Note on 3D-Clip Optimisation 

      Hubl, Josef (Blackwell Science Ltd and the Eurographics Association, 1993)
      In order to optimize the transformation-clipping-pipeline of PHIGS or GKS-3D it is sometimes necessary to determine whether a plane intersects a perpendicular volume or not. The solution to this problem is not very ...

    • A Library for Developing PHIGS Programming Tools in a PEX Environment 

      Wainer, Michael; Tan, Ting (Blackwell Science Ltd and the Eurographics Association, 1993)
      The merger of three-dimensional graphics with the X Window System has recently been standardized by adapting PHIGS, the Programmer s Hierarchical Interactive Graphics System, to the X Window System with PEX, the PHIGS ...

    • Spanning a C1-Surface over a Given Wireframe 

      Tokumasu, Shinji; Harashima, Ichirou; Nakajima, Norihiro (Blackwell Science Ltd and the Eurographics Association, 1993)
      A problem of spanning a surface of C1 continuity (C1-surface) over a given wireframe is introduced. By exploiting the concept of a super surface patch introduced in an earlier paper, we proved the existence of an approximate, ...

    • Ray Tracing an Octree: Numerical Evaluation of the First Intersection 

      Gargantini, I.; Atkinson, H. H. (Blackwell Science Ltd and the Eurographics Association, 1993)

    • The Determination of Form-Factors by Lookup Table 

      Sun, Jizhou; Zou, L.Q.; Grimsdale, R.L. (Blackwell Science Ltd and the Eurographics Association, 1993)
      Current methods for computer image synthesis using the radiosity algorithm rely heavily on the calculation of geometrical properties, known as form-factors, which quantify the energy exchange between pairs of surfaces in ...

    • A Formal Specification of a Graphics System in the Framework of the Computer Graphics Reference Model 

      Duce, D. A.; Paterno, F. (Blackwell Science Ltd and the Eurographics Association, 1993)
      This paper is motivated by the emerging ISO/IEC Reference Model for Computer Graphics (CGRM) and the revision of the ISO/IEC computer graphics standard, the Graphical Kernel System (GKS). The paper explores the use of the ...

    • Electronic Kaleidoscopes for the Mind 

      Pickover, Clifford A.; Rudolph, Larry (Blackwell Science Ltd and the Eurographics Association, 1993)
      The goal ofthis article is to present an informal introduction and tutorial on aestheticallypleasing kaleidoscopic images. The article is intended for the non-mathematical reader interested in computer art. Simple generating ...

    • Symmetrical Patterns from Dynamics 

      Chung, K. W.; Chan, H. S. Y. (Blackwell Science Ltd and the Eurographics Association, 1993)
      Automatic generation of symmetrical patterns belonging to all seventeen wallpaper groups is considered from a dynamical system s point of view. A pseudo-code of the algorithm is provided to generate the computer graphics. ...

    • PRIP - A Parallel Raster Image Processor 

      Van Campenhout, Jan M.; Lasure, Roeland (Blackwell Science Ltd and the Eurographics Association, 1993)
      Like colour video displays and laser printers, laser photoplotters are raster scan devices. For such devices, the pixel stream representing the image must be generated in real time, and in the (scan line) order required. ...