Browsing EG1988 Proceedings (Technical Papers) by Title

Now showing items 13-32 of 41

    • Efficient Adaptive Subdivision of Bezier Surfaces 

      Clay, Reed D.; Moreton, Henry P. (Eurographics Association, 1988)
      The support of free-form surfaces by modem solid modeling systems has necessitated the development of hardware and algorithms for the interactive display of surface patches. This paper describes an algorithm for the display ...

    • An Evaluation of CSG Trees Based on Polyhedral Solids 

      Badouel, Didier; Hegron, Gerard (Eurographics Association, 1988)
      Set operation on polyhedra is an important component of Geometric Modeling System (GMS) when a Constructive Solid Geometry (CSG) representation with polyhedral solid primitives is used. Output data will be the unique ...

    • A Evalution of Some Three-Color Tiling Patterns 

      Alt, Paul; Cordonnier, Vincent (Eurographics Association, 1988)
      Some new technologies for information display use discrete arrays of cells or picture elements. Each cell displays a single color and the colors do not overlap as they do on a CRT screen. Colored cells are distributed on ...

    • Experimenting with a Parallel Ray-Tracing Algorithm on a Hypercube Machine 

      Priol, Thierry; Bouatouch, Kadi (Eurographics Association, 1988)
      A parallel space tracing algorithm is presented. It subdivides the scene into regions. These latter are distributed among the processors of an iPSC hypercube machine designed by Intel company. Each processor subdivides its ...

    • An Expert System for Polyhedra Modelling 

      Martin, Philippe; Martin, Dominique (Eurographics Association, 1988)
      Very often we wish to construct shapes according to some criteria, which are properties we want the object to possess. In this case explicit construction becomes an inadapted way of working. One would wish to obtain the ...

    • Fast Algorithm for Polygon Clipping with 3D Windows 

      Burkert, Andreas; Noll, Stefan (Eurographics Association, 1988)
      Many applications which use 3D graphics, need 3D geometric modeling and hence polygon clipping against 3D Windows or general volumes. The disadvantages of existing clipping algorithms are that they are 2D, slow or produce ...

    • Form-Factors for General Environments 

      Shao, Ping-Pine; Peng, Qun-Sheng; Liang, You-Done (Eurographics Association, 1988)
      A new algorithm, based on the hemi-cube formulation, which calculates the form-factors required by the solution of the rendering equation, is presented. The concept of form-factors of the standard radiosity method is ...

    • A Formal Specification of a Boundary Representation 

      Baumann, Peter (Eurographics Association, 1988)
      Geometric modellers are used in a wide spectrum of applications in computer graphics. As many other applications use the generated internal representation of solids, semantic correctness is of special importance. On the ...

    • Fractal Approximation of 2-D Object 

      Levy-Vehel, J.; Gagalowicz, A. (Eurographics Association, 1988)
      We present some new techniques for shape approximation with fractals, using Iterated Function System, a powerful method which allows good control on the resulting fractal. The main point discussed here can be stated as ...

    • Free-Form Surfaces Modeling by Evolution Simulation 

      Lienhardt, Pascal (Eurographics Association, 1988)
      We present in this paper a procedural method for modeling free-form, planar surfaces subdivisions, which allows simulating evolutions of such subdivisions. This method is founded on the common principles deduced from ...

    • G1 Smoothing Solid Objects by Bicubic Bezier Patches 

      Liang, Youdong; Ye, Xiuzi; Fang, Shiaofen (Eurographics Association, 1988)
      A general and unified method is presented for generating a wide range of 3D objects by smoothing the vertices and edges of a given polyhedron with arbitrary topology using bicubic Bezier patches. The common solution to the ...

    • Generation of High-Quality Curve and Surface with Smoothly Varying Curvature 

      Higashi, Masatake; Kaneko, Kohji; Hosaka, Mamoru (Eurographics Association, 1988)
      A method for generating curves and surfaces which satisfy constraints of tangent directions and curvature at arbitrary points and which have smoothly varying curvature is introduced. The method is geometrical determination ...

    • Grafields: Field-Directed Dynamic Splines for Interactive Motion Control 

      Pintado, Xavier; Fiume, Eugene (Eurographics Association, 1988)
      This paper presents an interactive system for motion control that emphasizes object interaction. The fundamental mechanism provided to support interaction between objects is the field. We present a new technique called ...

    • IXPHIGS: A Portable Implementation of the International PHIGS Standard 

      Gorog, Jenö; Krammer, Gergely; Vincze, Arpad (Eurographics Association, 1988)
      This paper describes a "portable" object-oriented implementation of the international standard PHIGS. A rapid prototype has been achieved by making use of earlier developments : the IX-CGI module for graphical input, output ...

    • Liberation from Rectangles: A Tiling Method for Dynamic Modification of Objects on Raster Displays 

      Slater, Mel; Davison, Allan; Smith, Mark (Eurographics Association, 1988)
      When graphics objects (also called segments) are used on raster display hardware, problems arise because of the mismatch between the high level requirements of object manipulation, and the low level representation from ...

    • METAVIEWS: A Process-Oriented Approach to CAD and Graphics 

      Takala, Tapio (Eurographics Association, 1988)
      A system-theoretic approach to the computer aided design (CAD) process is presented. Dependency network among objects, consisting of design operations - transactions - is formed automatically during design. The derivation ...

    • A Method for Providing Full Interactive Control of the Shape of 3-D Curves and Surfaces 

      Cros, Frederic; Brock, Philip J. (Eurographics Association, 1988)
      This paper presents a new method for providing an interactive local control on 3-D curves and surfaces. The possibility of interacting directly on the vector tangent to the curve at each control point (e.g. changing its ...

    • Monte-Carlo Integration Applied to an Illumination Model 

      Bouville, C.; Dubois, J.L.; Marchal, I.; Viaud, M.L. (Eurographics Association, 1988)
      The use of Monte-Carlo integration together with stochastic sampling is very useful for dealing with the scattering phenomena that occur in the propagation and reflection of light. In this paper, these techniques have been ...

    • A New Algorithm for Converting Boundary Representation to Octree 

      Tang, Zesheng; Lu, Shengkai (Eurographics Association, 1988)
      Conversion algorithms between different object representations have become Increasingly important In soIid modeling system. In this paper, an algorithm for converting boundary representation of 3D object to octree structure ...

    • An Object-Oriented Approach to Process Monitoring 

      Hütter, Ronald (Eurographics Association, 1988)
      Current and future user interface requirements of process monitoring applications are summarized. An object-oriented approach to meet these requirements is described. A special displayfile structure, the socalled object-oriented ...