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Computer Graphics International, 1998. Proceedings

Date 26-26 June 1998

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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»

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  • Author index

    Publication Year: 1998, Page(s):798 - 800
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    Freely Available from IEEE
  • Hierarchical visibility culling with occlusion trees

    Publication Year: 1998, Page(s):207 - 219
    Cited by:  Papers (18)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    In the scope of rendering complex models with high depth complexity, it is of great importance to design output-sensitive algorithms, i.e., algorithms with the time complexity proportional to the number of visible graphic primitives in the resulting image. In this paper an algorithm allowing efficient culling of the invisible portion of the rendered model is presented. Our approach uses a spatial ... View full abstract»

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  • 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»

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  • Efficient and reliable triangulation of polygons

    Publication Year: 1998, Page(s):633 - 643
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    The author discusses a triangulation algorithm that is based on repeatedly clipping ears of a polygon. The main focus of the work was on designing an algorithm that is (1) completely reliable, (2) easy to implement, and (3) fast in practice. The algorithm was implemented in ANSI C, based on floating-point arithmetic. Due to a series of heuristics that get applied as a back-up for the standard ear-... View full abstract»

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  • 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»

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  • 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»

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  • Semi-automatic modelling of urban buildings from high resolution aerial imagery

    Publication Year: 1998, Page(s):588 - 596
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    A method is presented to (semi-)automatically generate 3D models of urban buildings from aerial images. The process starts by selecting (with a mouse click) one or more roofs in the image(s). The program then automatically delineates the roof structures in the images and extracts straight line segments which are matched across different views and reconstructed in 3D. These 3D line segments are the... View full abstract»

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  • Improved triangular subdivision schemes

    Publication Year: 1998, Page(s):626 - 632
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2536 KB)

    The authors improve the butterfly and Loop's (1987) algorithm. As a result they obtain subdivision algorithms for triangular nets which can be used to generate G1- and G2-surfaces, respectively View full abstract»

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  • 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»

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  • Memory management schemes for radiosity computation in complex environments

    Publication Year: 1998, Page(s):706 - 714
    Cited by:  Papers (1)
    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»

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  • Stability conditions for free form surfaces

    Publication Year: 1998, Page(s):41 - 47
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    In CAD/CAM technology, the design of free form surfaces is the beginning of a chain of operations, which ends with the numerically controlled (NC) production of the designed object. An important part of this chain is shape analysis. We present a stability concept for surfaces based on infinitesimal bendings. The infinitesimal rigidity is enforced by certain boundary conditions View full abstract»

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  • Virtual 3D sculpturing with a parametric hand surface

    Publication Year: 1998, Page(s):178 - 186
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1452 KB)

    Many techniques have been developed for 3D object deformation. These techniques have been widely used in most CAD/CAM systems. Intuitive while efficient methods for interactive 3D object deformation in a VR environment, however, are rare. One of our current research projects is to develop such a technique based on the use of a sensor glove. The idea is to create a hand surface interpolating throug... View full abstract»

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  • Implicit surface reconstruction from 2D CT scan sections

    Publication Year: 1998, Page(s):583 - 586
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    In this paper a new method, using the skeleton-based implicit model, is introduced for shape reconstruction of objects from a set of data points organized in planar sections. To reduce complexity and computation time, the objects are described by a uniform field function and a “3D weighted skeleton”. The 3D skeleton is composed of planar elements and is deduced from the 2D Voronoi skel... View full abstract»

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  • Varying neighbourhood parameters for the computation of normals on surfaces in discrete space

    Publication Year: 1998, Page(s):616 - 625
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    A method is examined which computes normal vectors on binary discrete surfaces by making use of the local separation criterion of surfaces. The method considers points in the neighbourhood of a surface point in object space to recover information about the local surface inclination. The article examines and evaluates the different parameters used in the computation of the normals, such as neighbou... View full abstract»

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  • Real time simulation and visualization of NC milling processes for inhomogeneous materials on low-end graphics hardware

    Publication Year: 1998, Page(s):338 - 349
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    Simulation and visualization of NC milling processes has become an important step in computer aided manufacturing. The usage of stock materials with specific locally varying properties (such as density, accuracy, color, etc.) is becoming more important with new technologies emerging in the material industry. The authors' approach, using volumetric representation, has been adapted to these needs an... View full abstract»

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  • An architecture of a universal DBMS for graphics applications

    Publication Year: 1998, Page(s):373 - 385
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    This paper presents a new architecture of a database management system intended to be used together with existing graphics software. In the first place, a system with this architecture shall be capable of coping with the large variety of data representations typically found in the graphics domain. Data is stored in its original form, without prior conversions, thus conserving the maximum informati... View full abstract»

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  • Virtual Worlds-a virtual environment architecture

    Publication Year: 1998, Page(s):287 - 295
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    The authors present Virtual Worlds as an open architecture for large-scale virtual environments with multi-users. It is based on the integration of VRML, Java and the Internet bringing forth a cross-platform solution. Virtual Worlds is furnished with a set of tools and APIs that allow one to create, extend and customise one's own virtual environment View full abstract»

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  • 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»

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  • 3D visualization and evaluation of remote sensing data

    Publication Year: 1998, Page(s):455 - 465
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2376 KB)

    The parallel evaluation of remote sensing data from multiple sensors is complicated by different image scales and orientations. Thus, simultaneous visualization of the multi-sensor data is envisaged. For a spatial impression of the observed area the images are co-registered, projected onto a 3D terrain model and displayed stereoscopically. The presented 3D evaluation system allows real-time naviga... View full abstract»

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  • Rational quadratic Bezier triangles on quadrics

    Publication Year: 1998, Page(s):34 - 40
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    First, different ways of solving the problem, if a given rational triangular Bezier patch of degree 2 lies on a quadric surface, are presented. Although these approaches are theoretically equivalent, their difference from the practical point of view is illustrated by analysing and comparing the numerical condition of the respective problems. Second, given a rational triangular Bezier patch of degr... View full abstract»

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  • 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»

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  • Multiresolution triangular B-spline surfaces

    Publication Year: 1998, Page(s):166 - 177
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1520 KB)

    We present multiresolution B-spline surfaces of arbitrary order defined over triangular domains. Unlike existing methods, the basic idea of our approach is to construct the triangular basis functions from their tensor product relatives in the spirit of box splines by projecting them into the barycentric plane. The scheme works for splines of any order where the fundamental building blocks of the s... View full abstract»

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  • An adaptable modular software architecture for distant control of virtual actors

    Publication Year: 1998, Page(s):245 - 247
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (24 KB)

    This paper presents an adaptable software architecture for distributed real-time animation of 3D virtual actors. The animation system is divided into several modules that are running either on the server or on the client. This approach enables an individual configuration of the system according to the demands of the connection and the software and hardware performance of the involved computers View full abstract»

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