Now showing items 1-20 of 43


      - (Eurographics Association, 1987)
    • A Metric for Computing Adaptive Detail in Animated Scenes Using Object-Oriented Programming 

      Blake, Edwin H. (Eurographics Association, 1987)
      A spatial metric for adapting the level of detail in a modelled object to achieve a convincing degree of realism on a display is formulated and illustrated with a simple implementation. This spatial metric is designed to ...
    • 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 ...
    • Designing a System to Provide Graphical User Interfaces: The THESEUS Approach 

      Huebner, W.; Lux-Mulders, G.; Muth, M. (Eurographics Association, 1987)
      This paper presents the design of THESEUS, a system for programming graphical user interfaces especially targetted at the area of software engineering. Starting with the special needs and requirements that arise in this ...
    • Viz: A Production System Based User Interface Management System 

      van Harmelen, Mark; Wilson, Stephanie M. (Eurographics Association, 1987)
      A production system based User Interface Management System (UIMS) is discussed. The UIMS, called Viz, has been designed and implemented in a windowed workstation environment, and (a) capitalises on the graphical facilities ...
    • Bezier Patches with Local Shape Control Parameters 

      Schmitt, Francis J. M.; Du, Wen-Hui (Eurographics Association, 1987)
      In this paper, we introduce three types of shape control parmeters (tension, bias, and continuity) into the modelling of free-form surfaces composed of bicubic Bernstein-Bezier patches. This is an extension to surfaces of ...
    • The Clockworks: An Object-Oriented Computer Animation System 

      Breen, David E.; Getto, Phillip H.; Apodaca, Anthony A.; Schmidt, Daniel G.; Sarachan, Brion D. (Eurographics Association, 1987)
      The Clockworks is an object-oriented computer animation system developed at RPl's Center for Interactive Computer Graphics (CICG). The Clockworks has the ability to model and graphically simulate complex 3-D engineering ...
    • Extraction and Organization of Form Features into a Structured Boundary Model 

      Falcidieno, Bianca; Giannini, Franca (Eurographics Association, 1987)
      A method is presented for the automatic identification and extraction of feature information from the solid model of an object. The procedure consists of recognizing shape features, extracting those features as solid volumes ...
    • Extended Octtrees, between CSG Trees and Boundary Representations 

      Navazo, Isabel; Fontdecaba, Josep; Brunet, Pere (Eurographics Association, 1987)
      Besides the most widely used models in the Geometric Modeling Systems, Constructive Solid Geometry (CSG) and Boundary Representations (BR), Octtrees have appeared as an alternative representation scheme which is particularly ...
    • 3D Models in Computer-Assisted Chemistry 

      Roch, Michel; Cretegny, Isabelle; Weber, Jacques (Eurographics Association, 1987)
      Novel and efficient algorithms have been developed in order to display on a raster scan device some basic 3D models used in computer-assisted chemistry. They allow, among other things, the construction and manipulation of ...
    • An Approach to the Formal Specification of Configurable Models of Graphics Systems 

      Arnold, D.B.; Duce, D.A.; Reynolds, G.J (Eurographics Association, 1987)
      This paper describes a general framework for the formal specification of modular graphics systems. The approach is illustrated by an example taken from the Graphical Kernel System (GKS) and uses the Z specification notation.
    • 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 ...
    • HIRASP: A Hierarchical Interactive Rastergraphics System Based on Pattern Graphs and Pattern Expressions 

      Teunissen, Wim J.M.; van den Bos, Jan (Eurographics Association, 1987)
      To exploit the full capabilities of raster graphics, two and three dimensional drawing primitives should play a preponderant role in the specification of a graphics standard. In addition there should be facilities for ...
    • A Means to Improve the GKS-3D/PHIGS Output Pipeline Implementation 

      Herman, Ivan; Reviczky, Janos (Eurographics Association, 1987)
      The output pipeline of GKS-3D/PHIGS isexamined to find some possible points where the implementation could be improved to raise efficiency while remaining strictly within the scope of the Standards. Some interesting results ...
    • 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 ...
    • Efficient and Consistent Algorithms for Determining the Containment of Points in Polygons and Polyhedra 

      Chen, Min; Townsend, Teeter (Eurographics Association, 1987)
      Algorithms are presented for the determination of whether a given point E<sup>2</sup> in is interior to, exterior to or on an arbitrary polygonal boundary and for the determination of whether a point in E <sup>3</sup> is ...
    • Display of Solid Models with a Multi-Processor System 

      Jansen, Frederik W.; Sutherland, Robert J. (Eurographics Association, 1987)
      There is a growing need for fast high-quality display of solid objects. Recently-developed custom-VLSI hardware offers high-speed display but lacks the flexibility and processing power at the pixel level to sustain the ...
    • A New Scan Line Algorithm for the Rendering of CGS Trees 

      Pueyo, Xavier; Mendoza, Joan Carles (Eurographics Association, 1987)
      A scan line algorithm is proposed to render CSG modelled solids. Scan planes intersections are obtained by means of a proposed generalisation of Porter’s algorithm. 2-D scan plane primitives are decomposed in a way that ...
    • An Automatic Interpolation Method of Grayvalued Images Utilizing Density Contour Lines 

      Agui, Takeshi; Saito, Minoru; Nakajima, Masayuki; Arai, Yukihiro (Eurographics Association, 1987)
      This paper presents an automatic method of interpolation or inbetweening for gray valued images, which have been difficult to be processed automatically. The method consists of three parts. The first i s the extraction of ...
    • 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 ...