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Browsing Volume 06 (1987) by Title

Now showing items 89-108 of 114

    • Parallel Graphical Output from Dialogue Cells 

      Ten Hagen, P.J.W.; Schouten, H.J. (Eurographics Association, 1987)
      A system that accepts and processes graphical output from parallel processes using a single workstation, and its use in a User Interface Management System called Dialogue Cells, is described. It allows for a programmer to ...

    • Parallel Polygon Rendering with Precomputed Surface Patches 

      Theoharis, Theoharis; Page, Ian (Eurographics Association, 1987)
      We describe an algorithm for rendering a restricted class of trapeziums, and hence arbitrary polygons, in parallel on an NxN SIMD array processor. The algorithm achieves good performance by precomputing “surface patches” ...

    • Preserving the Area of Regions 

      Williams, Richard (Blackwell Publishing Ltd and the Eurographics Association, 1987)
      When regions are represented by their boundary, the number of points ((x, y) coordinate pairs) used to define the boundary can vary. Many more points are required to satisfactorily display a region at a detailed scale than ...

    • RasterCalc: Calculus for Operations on Graphics Colour Rasters 

      van den Bos, Jan (Blackwell Publishing Ltd and the Eurographics Association, 1987)
      An extended model and calculus, called RasterCalc, is presented for operations on discrete graphics rasters, including their colour functions. The operations are separated into two main categories: operations on domains, ...

    • Real-Time Scan-Line In-Fill 

      Allerton, D. J.; Evemy, J. D.; Zaluska, E. J. (Eurographics Association, 1987)
      A novel algorithm is described to perform in-fill of wire-frame polygons, typically for application in visual systems for flight simulation. Post-processing is performed on an image formed in a conventional raster-scan ...

    • The Reconstruction of Neurone Morphology from Thin Optical Sections - Graphical Aspects 

      Brown, A. D.; Wheal, H. V.; Stockley, E. W. (Eurographics Association, 1987)
      The aims of the project are two-fold: firstly, to create an accurate three-dimensional model of a neurone from the mammalian nervous system, which can be used to obtain quantitative geometric and topological data on the ...

    • Scan Converting Extruded Lines at Ultra High Definition 

      Willis, Philip; Watters, Geoff (Blackwell Publishing Ltd and the Eurographics Association, 1987)
      We consider the problem of generating freehand raster graphics pictures at ultra high definition (typically one gigapixel per picture) by scan converting extruded lines. We describe a fast scan conversion algorithm which ...

    • A Scanline Method for Solid Model Display 

      Patel, Manjula; Hubbold, Roger J. (Blackwell Publishing Ltd and the Eurographics Association, 1987)
      The modelling of solid objects is becoming increasingly important in the application of computer graphics to a wide variety of problems, such as CAD/CAM, simulation, and molecular modelling. A variety of methods for rendering ...

    • Shape Approximation by a Fractal Model 

      Levy-Vehel, J.; Gagalowicz, A. (Eurographics Association, 1987)
      The use of fractals to synthesize complex objects is of current interest in the computer graphics community. A powerful way to compute fractals is the use of IFS (iterated function system) which is a set of contractions ...

    • A Shareable Centralised Database of KRT3 - A Hierarchical Graphics System Based on PHIGS 

      Howard, Toby (Eurographics Association, 1987)
      The Programmer’s Hierarchical Interactive Graphics System (PHIGS), currently under development by ISO, is a specification of a set of functions for device-independent computer graphics programming, supporting dynamic ...

    • SIGHT-A Dedicated Computer Graphics Machine 

      Naruse, Tadashi; Yoshida, Masaharu; Takahashi, Tokiichiro; Naito, Seiichiro (Blackwell Publishing Ltd and the Eurographics Association, 1987)
      The. architecture of, and a performance estimate for, the dedicated graphics processor - SIGHT, a high-speed ray tracing machine, are presented. Ray tracing is a vector calculation in 3-dimensional (3-D) space and each ray ...

    • A Simple and Efficient Haloed Line Algorithm for Hidden Line Elimination 

      Franklin, W.R; Akman, V. (Blackwell Publishing Ltd and the Eurographics Association, 1987)
      An efficient algorithm, HALO, is given to compute haloed line drawings of wire frame objects. Haloed line drawings are described by Appel et al.1HALO has two parts: CUT and DRAW. CUT uses an adaptive grid to find all edge ...

    • Some Aspects of Binding GKS to C++ 

      Richards, J.E. (Blackwell Publishing Ltd and the Eurographics Association, 1987)
      Aspects of a prototype binding of GKS to the C++ programming language are presented. The binding makes use of classes and derived classes to define GKS concepts such as segments and workstations. Operator overloading is ...

    • Splines for Engineers 

      Ohlin, S.C. (Eurographics Association, 1987)
      This paper introduces the concept of interpolation consistency. It is claimed that this property is an essential one for splines that are intended for use in Computer Aided Design. Consistency is defined as the property ...

    • Systolic Architecture for Boolean Operations on Polygons and Polyhedra 

      Krishnan, D.; Patnaik, L.M. (Blackwell Publishing Ltd and the Eurographics Association, 1987)
      In Computer-Aided Design applications there is often a need to compute the union, intersection and Merence of two polygons or polyhedra. The sequential algorithms for this problem are characterized by poor speed of response ...

    • A Temporal Scripting Language for Object-Oriented Animation 

      Fiume, E.; Tsichritzis, D.; Dami, L. (Eurographics Association, 1987)
      Object orientation and concurrency are inherent to computer animation. Since the pieces of an animation can come from various media such as computer-generated imagery, video, and sound, the case for object orientation is ...

    • UltraPaint: A New Approach to a Painting System 

      Watters, Geoff; Willis, Philip (Blackwell Publishing Ltd and the Eurographics Association, 1987)
      The ideas underlying a Painting System being developed at the University of Bath are introduced. This differs from a conventional system in that ultra high definition pictures of upto 1 gigabyte may be created. We discuss ...

    • Unifying Vector and Polygon Algorithms for Scan Conversion and Clipping 

      Kilgour, AIistair (Eurographics Association, 1987)
      In both scan conversion and clipping, algorithm for dealing with polygons are generally presented independently of those for vectors, although many of the operations performed are similar. This paper shows how polygon ...

    • A User-Interface Toolkit in Object-Oriented PostScript Owen M. Densmore 

      Densmore, Owen M.; Rosenthal, David S. H. (Blackwell Publishing Ltd and the Eurographics Association, 1987)
      Only the diehards want to develop applications using basic window system facilities. The preferred approach is a higher-level"toolkit" of user interface components, such as menus and scroll bars. Experience with current ...

    • Using Abstract Data Types To Define Large-scale World Models For Image Generation Systems 

      Marsh, S.C.; Grimsdale, R.L. (Blackwell Publishing Ltd and the Eurographics Association, 1987)
      The creation of databases for real-time image generation systems is expensive and time consuming. This is mostly due to the method of defining the world models which can currently represent an area of up to 500,000 sq Km. ...