Proceedings. Computer Graphics International (Cat. No.98EX149)

26-26 June 1998

Filter Results

Displaying Results 1 - 25 of 96
  • Proceedings. Computer Graphics International (Cat. No.98EX149)

    Publication Year: 1998
    Request permission for commercial reuse | PDF file iconPDF (496 KB)
    Freely Available from IEEE
  • An anti-aliasing method for parallel rendering

    Publication Year: 1998, Page(s):228 - 235
    Cited by:  Papers (1)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (165 KB)

    We describe a parallel rendering method based on the adaptive supersampling technique to produce anti-aliased images with minimal memory consumption. Unlike traditional supersampling methods, this one does not supersample every pixel, but only those edge pixels. We consider various strategies to reduce the memory consumption in order for the method to be applicable in situations where limited or f... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Author index

    Publication Year: 1998, Page(s):798 - 800
    Request permission for commercial reuse | PDF file iconPDF (262 KB)
    Freely Available from IEEE
  • Design of anisotropic functions within spatial analysis of data

    Publication Year: 1998, Page(s):726 - 729
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (28 KB)

    The calculation of the minimum cost path is one of the newest tools in the spatial analysis of data. The problem acquires an added complexity when the cost associated to a phenomenon not only depends on its intensity but also on the direction in which it is revealed in the space. In this case, the authors run into an anisotropic phenomenon where the friction associated with it is also anisotropic.... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new type of free-form curve given by an integral form

    Publication Year: 1998, Page(s):722 - 725
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The paper proposes a new type of free-form curve for fairness. A unit quaternion curve is used to specify the tangent of the curve in order to more directly manipulate its curvature and variation of curvature than is possible for the traditional parametric representations like Bezier and NURBS curves. Since the new curve is represented by can integral form of a unit quaternion curve, it is named u... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Using scattered data interpolation for radiosity reconstruction

    Publication Year: 1998, Page(s):715 - 720
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The authors present an analysis of the impacts of different interpolation methods on the reconstruction of the radiosity function across a patch. Two groups of methods are compared: one group based on regular grids and the other based on adaptive patch subdivisions. They handle points on adaptive subdivisions as scattered data points which opens the field of scattered data interpolation. Visual an... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ridges and ravines on implicit surfaces

    Publication Year: 1998, Page(s):530 - 535
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (100 KB)

    Surface creases provide us with important information about the shapes of objects and can be intuitively defined as curves on a surface along which the surface bends sharply. Our mathematical description of such surface creases is based on a study of extrema of the principal curvatures along their curvature lines. On a smooth generic surface we define ridges to be the local positive maxima of the ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A prototype system for light propagation in terrains

    Publication Year: 1998, Page(s):103 - 106
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (44 KB)

    We present a prototype system for a simple version of electromagnetic wave propagation prediction in rural areas, using a real time exploration environment for very large topographic scenes. The wave propagation prediction algorithm is based on a simple line of sight approach, realized with a modified hidden surface removal algorithm. The system serves as a transmitter management tool for interact... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • VEplatform: a base system for distributed virtual reality

    Publication Year: 1998, Page(s):568 - 569
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (20 KB)

    The VEplatform project aims at the development of a highly scalable system which allows distributed virtual reality applications to be built. The system is decentralised i.e. there is no central component which controls it and which can become a bottleneck. At this moment VEplatform is already a working system allowing many participants to join a virtual world. In this article the software archite... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Memory management schemes for radiosity computation in complex environments

    Publication Year: 1998, Page(s):706 - 714
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    Hierarchical radiosity is a very demanding process in terms of computation time and memory resources even for scenes of moderate complexity. To handle complex environments which don't fit in the memory, new solutions have to be devised. One solution is to partition the scene into subsets of polygons (3D cells or clusters) and to maintain in memory only some of them. The radiosity computation is pe... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Visibility as an intrinsic property of geometric models

    Publication Year: 1998, Page(s):198 - 206
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    This paper presents a technique to improves the performance of algorithms that exploits visibility based analysis in computer graphics, such as ray tracing. The presented approach maintains a list of visible polygons for each and every one of the polygons in the model as well as for optionally, the light sources in the scene. A pre-processing visibility analysis stage that is view-independent is c... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Incremental techniques for implicit surface modeling

    Publication Year: 1998, Page(s):312 - 321
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The paper describes an incremental polygonization technique for implicit surfaces built from skeletal elements. The method lends itself as an interactive modeling system as the mesh is updated locally in regions of space where changes in the potential field occurred. The authors rely on an octree decomposition of space combined with Lipschitz conditions to recursively subdivide cells until a given... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • WebVizard: intelligent system for geodata visualization and CBT in the WWW

    Publication Year: 1998, Page(s):113 - 122
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    The aim of this paper is primarily to cover the possibilities and problems of GIS in the WWW. A second aim is to show trends in the areas of CBT and Teleteaching in general and one possible approach of using CBT in a GIS, namely WEBVIZARD. In the WWW there are many Geographic Information Systems (GIS) which use databases. But the possibilities of data access and data visualization are restricted b... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Automatic creation of flexible antropomorphic models for 3D videoconferencing

    Publication Year: 1998, Page(s):520 - 527
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1924 KB)

    The contribution describes the automatic creation of highly realistic flexible 3D models of participants for distributed 3D videoconferencing systems. The proposed technique uses a flexible mesh template surrounding an interior skeleton structure, which is based on a simplified human skeleton. The vertices of this template are arranged in rigid rings along the bones of the skeleton. Using 3D data ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Floating ring: a new tool for visualizing distortion in map projections

    Publication Year: 1998, Page(s):466 - 480
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The authors present a new method for interactive visualization of distortion in map projections. The central idea is a floating ring on a sphere (globe) that can be interactively positioned and scaled. As the ring is manipulated on the globe, the corresponding projection of the ring is distorted using the same map projection parameters. They apply this method to study a real and angular distortion... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A data dependent triangulation for vector fields

    Publication Year: 1998, Page(s):96 - 102
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1052 KB)

    The article deals with dependencies of a piecewise linear vector field and the triangulation of the domain. It shows that the topology of the field may depend on the triangulation and gives a suitable choice to obtain a simple topology by changes of the triangulation. The main point is the appearance of pairs of critical points with positive and negative Poincare index. Many of these occurrences c... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Scaling VR in VRML: integrating different VR methodologies in a VRML browsing system

    Publication Year: 1998, Page(s):564 - 567
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    In this paper we examine the potential of the virtual reality modeling language (VRML) to support different methodologies used in virtual reality (VR), like head tracking or special VR input and output devices. A realization concept is presented and its implementation in the VRML browser CASUS Presenter is described View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Volume modelling: representations and advanced operations

    Publication Year: 1998, Page(s):4 - 13
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    We present our approach to volume modelling which combines volume representations by voxel data and by continuous real functions. We discuss the main differences between direct volume visualization and modelling with voxel data, questions of conversion between two representations including volume reconstruction from contour data. We illustrate the approach by several advanced operations on a volum... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Integration of basic CAD functions into a VR environment

    Publication Year: 1998, Page(s):238 - 241
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (104 KB)

    This paper gives a survey of the integration of basic computer aided design functions in a virtual reality environment. Motivated by the limited input and output devices of present CAD systems, we try to improve the human interaction by using VR for operation in a three dimensional space. This paper presents the underlying data structures and operations, through which the user can transpose his id... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Tailor made dynamic programming for edge matching

    Publication Year: 1998, Page(s):700 - 705
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The authors present an edge pixel matching algorithm based on dynamic programming. Unlike classical dynamic programming methods, where a path is searched for across a graph of the whole space of edge pixels, the approach allows the optimal path to be within a constrained search space, and thus tremendously cutting off the searching time. The knowledge of the camera parameters lends itself to reduc... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Sculpting and animating in a desktop VR environment

    Publication Year: 1998, Page(s):187 - 195
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    Precise control of the shape of a flexible object during animation is a time-consuming task for the animator, for which there is, as yet, no universally-applicable method. This paper describes a system which provides improved support in this area. In the system, objects are modelled within a stereoscopic environment, and the user interfaces with the system via two hand-held devices, a SpaceBall an... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Graph-based surface reconstruction using structures in scattered point sets

    Publication Year: 1998, Page(s):298 - 311
    Cited by:  Papers (10)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1796 KB)

    The authors present an algorithm for the reconstruction of a surface from an unorganized set of points in space. The point data may be obtained from a laser range scanner or any other digitizing tool to describe the shape of the object(s). The basic idea of the algorithm is to construct some kind of wire frame for the surface, the so-called surface description graph. This is performed by applying ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Visualization of fluid displacement in porous media

    Publication Year: 1998, Page(s):740 - 751
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    Modelling, simulation, and visualization of porous media have practical applications in the petroleum and chemical industries. Advances in modelling and simulation of porous media can help in the understanding of processes in petroleum rocks. The paper presents new algorithms for modelling and visualizing fluid interfaces within porous media. These algorithms allow the creation and nondestructive ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Visualization of geographic data using VRML-an Internet client, for a geographic information system (GIS)

    Publication Year: 1998, Page(s):111 - 112
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (20 KB)

    For centuries, geographic data has been visualized and published in the form of static maps and displays. However with the advent of geographic information systems (GIS) it becomes possible to make use of new electronical means for both publishing and visualizing geographic data. The paper describes the concept of a World Wide Web client that can directly request data from a GIS, displaying it as ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Integration techniques for 3D surface reconstruction

    Publication Year: 1998, Page(s):575 - 577
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (16 KB)

    This paper describes on-going research about integration techniques for 3D surface reconstruction. Our goal is to establish simple and robust 3D models for the growing needs of visual communication. Introducing and analyzing some typical techniques, we propose a new method for generating complete 3D models of complex objects-combining “shape from occluding contours” and photometric ste... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.