Proceedings Computer Graphics International 2000

19-24 June 2000

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  • Proceedings Computer Graphics International 2000

    Publication Year: 2000
    Request permission for commercial reuse | PDF file iconPDF (367 KB)
    Freely Available from IEEE
  • Hybridization techniques for fast radiosity solvers

    Publication Year: 2000, Page(s):269 - 278
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (430 KB)

    The authors study, both theoretically and experimentally some properties of classical linear systems solvers, according to the radiosity assumptions. We prove important properties for some of these solvers which allow the user to choose the best one. We then introduce a new technique, so called hybridization, whose purpose is to increase the convergence speed of iterative methods. It provides very... View full abstract»

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  • Author index

    Publication Year: 2000, Page(s): 353
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    Freely Available from IEEE
  • Hair rendering by jittering and pseudo shadow

    Publication Year: 2000, Page(s):287 - 291
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    Proposes two properties of hair that we believe are essential to realistic hair rendering. To satisfy these two properties of hair, we introduce the “jittering and pseudo-hair model”. The jittering and pseudo-shadows are achieved through the use of a shadow factor. Experimental results show that, with the incorporation of these two properties, hair images look more natural than images ... View full abstract»

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  • Orientation lightmaps for photon tracing in complex environments

    Publication Year: 2000, Page(s):279 - 286
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    We present a method that makes the use of photon tracing methods feasible for complex scenes when a totally accurate solution is not essential. This is accomplished by using orientation lightmaps, which average the illumination of complex objects depending on the surface normal. Through this averaging, they considerably reduce the variance of the stochastic solution. In order to use these speciali... View full abstract»

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  • X-machines+L-systems=XL-systems

    Publication Year: 2000, Page(s):127 - 134
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    A. Lindenmayer (1968) developed a type of formal language called an L-system. Similar to formal languages, L-systems define a method by which a string of symbols can be rewritten or parsed into another string using a set of rewrite rules. X-machines are generalised state automata. This paper takes another look at this way of generating plants and provides a convenient way of taking component L-sys... View full abstract»

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  • Homological invariants and holorgraphic representations of topological structures in cellular spaces

    Publication Year: 2000, Page(s):89 - 97
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    Geometric modeling and computational representations of shapes have been subject to intense research for more than three decades. Interestingly, these subjects are still at the heart of a continuous activity of research and development in computer graphics, virtual environments, image-based rendering, computer-aided geometric design and physical simulations. Currently, geometric and physically-bas... View full abstract»

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  • Implementing fast cloth simulation with collision response

    Publication Year: 2000, Page(s):257 - 266
    Cited by:  Papers (22)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The article details and implements efficient techniques for cloth simulation, both in the area of numerical simulation and the area of collision detection and response. Emphasis is put on the efficient implementation of implicit numerical methods with many improvements toward better realism, as well as computation simplicity. A constraint based collision response scheme is adapted to this scheme i... View full abstract»

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  • VPARK - a Windows NT software platform for a virtual networked amusement park

    Publication Year: 2000, Page(s):309 - 315
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Presents the VPARK (Virtual Park) system, which includes a networked virtual environment (NVE) system called W-VLNET and an “attraction building system” that is able to create and modify the attractions used in the NVE. Both systems have been developed in the Windows NT environment. The paper outlines the techniques for communication, scene management, facial and body animation, and ge... View full abstract»

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  • A homotopy model for cup lifting

    Publication Year: 2000, Page(s):117 - 125
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    Introduces two new theoretical tools - homotopy and cellular structured spaces - for visualization. Any object is represented by a filtration space, which is a sequence of skeletons that are topological spaces. Using an attaching function that attaches n-1 dimensional balls to the boundaries of n-dimensional balls, a filtration space is composed inductively and step-by-step, by increasing the dime... View full abstract»

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  • Visual simulation of texture/non-texture image synthesis

    Publication Year: 2000, Page(s):343 - 351
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    We propose a new and effective image modeling dual technique which is capable of simulating both texture image synthesis and non-texture images like fractals. The technique uses the algebraic approach of graph grammars theory as a new simulation tool for both texture and non-texture image synthesis via its graph production, derivation and double-pushout construction. Validation of our approach is ... View full abstract»

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  • LATEX human motion planning based on recursive dynamics and optimal control techniques

    Publication Year: 2000, Page(s):19 - 28
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The 3D simulation of human activity based on physics, kinematics, and dynamics in terrestrial and space environments, is becoming increasingly important. Virtual humans may be used to design tasks in terrestrial environments and analyze their physical workload to maximize success and safety without expensive physical mockups. Previously (J. Lo and D. Metaxas, 1999), we presented an efficient optim... View full abstract»

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  • Visualization of eclipses and planetary conjunction events. The interplay between model coherence, scaling and animation

    Publication Year: 2000, Page(s):81 - 86
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The problem of an instructive and realistic animation and visualization of the shadow and color-conditions during conjunctions of actively and passively illuminated cosmic objects has found only partially satisfying solutions so far. As an example we study a total solar eclipse. There are didactic shortcomings of specialized astronomical software, even though solutions have been given, which are v... View full abstract»

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  • Fast and stable animation of cloth with an approximated implicit method

    Publication Year: 2000, Page(s):247 - 255
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Realistic animation of soft objects such as cloth is essential for plausible character animation. Many techniques have been proposed for the simulation of soft objects, and most of them are based on numerical integration. Among the techniques, the implicit integration method is the most likely technique for real time environments, since it allows large time steps for cloth simulation by ensuring t... View full abstract»

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  • Augmented reality for real and virtual humans

    Publication Year: 2000, Page(s):303 - 307
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1812 KB)

    Current virtual reality technologies provide many ways to interact with virtual humans. Most of those techniques, however, are limited to synthetic elements and require cumbersome sensors. We have combined a real-time simulation and rendering platform with a real-time, non-invasive vision-based recognition system to investigate interactions in a mixed environment with real and synthetic elements. ... View full abstract»

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  • Crack pattern simulation based on 3D surface cellular automaton

    Publication Year: 2000, Page(s):153 - 162
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    Describes a method for modeling the propagation of cracks on any 3D surface. Taking a previous cellular automata model of the authors (1999) as the basis, this method allows just about any type of cracks on any type of triangulated 3D object. Our model's main advantage is that it proposes a semi-physical solution, making it at the same time user-controllable and easily extendable. After summarizin... View full abstract»

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  • Real-time collision detection and response for complex environments

    Publication Year: 2000, Page(s):105 - 113
    Cited by:  Papers (2)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    Presents a method for collision detection that is well suited to complex environments, such as those obtained from medical imaging and for objects that are in permanent contact. The method is based on a point-in-tetrahedral-mesh query. Spatial and temporal coherence are used to achieve interactive speed. In addition to collision detection, the system calculates a force and torque that can be used ... View full abstract»

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  • Neural network-based violinist's hand animation

    Publication Year: 2000, Page(s):37 - 41
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    We present a system for the animation of a human hand that plays violin. A neural network controls the hand movement. We make use of an optimization method to generate examples for the neural network training. The musical decision of which finger to use is automatically made by best first search. We show that the movements of the violinist's hands are physically and musically feasible, and that th... View full abstract»

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  • Molecular dynamics visualization with XML and VRML

    Publication Year: 2000, Page(s):335 - 341
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    A new Extensible Markup Language (XML) application, Molecular Dynamics Language (MoDL) has been developed. MoDL provides a simple, but powerful tool for molecular dynamics visualization and has been developed by combining, for the first time, the strengths of XML and the Virtual Reality Modeling Language. The details of MoDL, its implementation and examples of its use are presented in this paper View full abstract»

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  • An animation toolkit based on motion mapping

    Publication Year: 2000, Page(s):11 - 17
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    We present a character animation toolkit for generating animation sequences interactively. It is based on a motion mapping technique that an object's motion can be applied to another object interactively. The toolkit generates the mesh for an object from several feature points on photo images automatically. An object's motion is defined and manipulated independently of modeling data. The motion ge... View full abstract»

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  • “The challenges of digital media: research issues and future directions”

    Publication Year: 2000, Page(s):195 - 200
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    A recent report by a panel of experts that advise the US President (Information Technology Advisory Committee), concluded that federal research on information technology (IT) is seriously inadequate. It urged spending on IT research to be increased by US1.4 billion by 2004, focussing on longer-term “visionary and high risk” projects that industry is unwilling to support itself. This In... View full abstract»

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  • VISJET-a computer ocean outfall modelling system

    Publication Year: 2000, Page(s):75 - 80
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    Sewage and industrial effluents from coastal cities are often discharged into the adjacent sea after some land-based treatment. In modern design, the wastewater is often discharged in buoyant jet groups from risers mounted on a submarine outfall on the seabed to achieve rapid mixing of effluents with tidal flow. A mathematical model for buoyant jets in currents based on the Lagrangian models, call... View full abstract»

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  • Simulated patient for orthognathic surgery

    Publication Year: 2000, Page(s):239 - 245
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (796 KB)

    Orthognathic surgery corrects a wide range of minor and major facial and jaw irregularities. This surgery will improve the patients' ability to chew, speak and breathe. In many cases, a better appearance will also result. With the recent advances in virtual reality (VR) and three-dimensional (3D) medical imaging technology, orthognathic surgery simulations typically requires costly volumetric data... View full abstract»

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  • Haptics issues in virtual environments

    Publication Year: 2000, Page(s):295 - 302
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4052 KB)

    Haptics is a recent enhancement to virtual environments, allowing users to “touch” and feel the simulated objects they interact with. Current commercial products allow tactile feedback through desktop interfaces (such as the FEELItTM mouse or the PHANToMTM arm) and dextrous tactile and force feedback at the fingertips through haptic gloves (such as the CyberTouch<... View full abstract»

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  • Local and global geometric methods for analysis, interrogation, reconstruction, modification and design of shape

    Publication Year: 2000, Page(s):137 - 151
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2740 KB)

    Gives an overview of some recent methods useful for local and global shape analysis and for the design of solids. These methods include, as new tools for global and local shape analysis, the spectra of the Laplace and Laplace-Beltrami operators and the concept of stable umbilical points, i.e. stable singularities of the “principal curvature line” wire-frame model of the solid's boundar... View full abstract»

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