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pacific conference on computer graphics and applications

作者： S. Gobron N. Chiba Iwate Software Center Inc. Morioka Japan Department of Computer Science Iwate University Morioka Japan

The paper describes a method for modeling the natural peeling phenomenon over any 3D surface. Using crack input data, precomputed with a semi physical solution, this method allows simulation of peeling on any type of triangulated 3D object. The model's main advantage is that it proposes a method that is intuitive enough to make it easy to understand and convenient to apply, user controllable, and easily extensible, especially to simultaneous natural phenomena. We first introduce the general development of peeling over various materials. Then, we present how to define groups of peeling, how to determine a realistic and natural peeling order, and how to simulate the rendering of two types of special peelings. Finally, a set of graphical results concludes the paper, presenting a series of direct peeling and curling patterns using classical paintings or plastic-paintings simulated materials.

关键词： Surface cracks Computational modeling computer graphics Automata computer science Rendering (computer graphics) Painting Biological materials Corrosion Stress

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Efficient rendering of lightning taking into account scattering effects due to clouds and atmospheric particles

Efficient rendering of lightning taking into account scatter...

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pacific conference on computer graphics and applications

作者： Y. Dobashi T. Yamamoto T. Nishita Hokkaido University Sapporo Japan University of Tokyo Bunkyo Tokyo Japan

A number of methods have been developed for creating realistic images of natural scenes. Their applications include flight simulators, the visual assessment of outdoor scenery, etc. Previously, many of these methods have focused on creating images under clear or slightly cloudy days. Simulations under bad weather conditions, however, are one of the important issues for realism. Lightning is one of the essential elements for these types of simulations. The paper proposes an efficient method for creating realistic images of scenes including lightning. Our method can create photo-realistic images by taking into account the scattering effects due to clouds and atmospheric particles illuminated by lightning. Moreover, graphics hardware is utilized to accelerate the image generation. The usefulness of our method is demonstrated by creating images of outdoor scenes that include lightning.

关键词： Lightning Light scattering Layout Particle scattering Rendering (computer graphics) Aerospace simulation Atmospheric modeling Clouds graphics Hardware

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A Subdivision Arrangement Algorithm for Semi-Algebraic Curves: An Overview

A Subdivision Arrangement Algorithm for Semi-Algebraic Curve...

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pacific conference on computer graphics and applications

作者： Julien Wintz Bernard Mourrain I.N.R.I.A. Sophia Antipolis Sophia-Antipolis France

ISBN: (纸本)9780769530093;0769530095

We overview a new method for computing the arrangement of semi-algebraic curves. A subdivision approach is used to compute the topology of the algebraic objects and to segment the boundary of regions defined by these objects. An efficient insertion technique is described, which detects regions in conflict and updates the underlying arrangement structure. We describe the general framework of this method, the main region insertion operation and the specializations of the key ingredients for the different types of objects: implicit, parametric or piecewise linear curves.

关键词： Topology Piecewise linear approximation Polynomials Data structures computer graphics Application software Piecewise linear techniques computer applications Arithmetic Equations

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Real-time Animation of Sand-Water Interaction

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computer graphics FORUM 2008年第7期27卷 1887-1893页

作者： Rungjiratananon, Witawat Szego, Zoltan Kanamori, Yoshihiro Nishita, Tomoyuki Univ Tokyo Tokyo 1138654 Japan

Recent advances in physically-based simulations have made it possible to generate realistic animations. However, in the case of solid-fluid coupling, wetting effects have rarely been noticed despite their visual importance especially in interactions between fluids and granular materials. This paper presents a simple particle-based method to model the physical mechanism of wetness propagating through granular materials;Fluid particles are absorbed in the spaces between the granular particles and these wetted granular particles then stick together due to liquid bridges that are caused by surface tension and which will subsequently disappear when over-wetting occurs. Our method can handle these phenomena by introducing a wetness value for each granular particle and by integrating those aspects of behavior that are dependent on wetness into the simulation framework. Using this method, a GPU-based simulator can achieve highly dynamic animations that include wetting effects in real time.

关键词： I.3.7 [computer graphics]: Three-Dimensional graphics and Realism

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A nondeterministic reconstruction approach for isotropic reflectances and transmittances

A nondeterministic reconstruction approach for isotropic ref...

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pacific conference on computer graphics and applications

作者： G.V.G. Batranoski J.G. Rokne Dept. of Comput. Sci. Calgary Univ. Alta. Canada Department of Computer Science University of Calgary Calgary AB Canada

Physically and biologically based reflectance and transmittance models add realism to image synthesis applications at the expense of a significant increase in rendering time. Current research efforts in this area focus on developing practical solutions to quickly access a BDF (which represents a combination of BRDF and BTDF) while preserving its original characteristics. An approach to reconstruct arbitrary isotropic BDFs is presented. The spectral curves obtained using the proposed approach are compared with measured spectral curves, and some issues regarding its performance and storage requirements are examined.

关键词： Biological system modeling Image reconstruction Application software Reflectivity Biological materials Anisotropic magnetoresistance computer science Physics Image generation Photometry

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Virtual spectrophotometric measurements for biologically and physically-based rendering

Virtual spectrophotometric measurements for biologically and...

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pacific conference on computer graphics and applications

作者： G.V.G. Baranoski J.G. Rokne Guangwu Xu Department of Computer Science University of Utah USA Department of Computer Science University of Calgary Canada Diversinet Corporation Toronto Canada

The main topic of the paper is virtual spectrophotometers, virtual spectrophotometry and strategies for reducing the number of samples required to obtain asymptotically convergent measurements. A brief section on applications of virtual spectrophotometry is presented. This is followed by a careful formulation of virtual spectrophotometers. A virtual spectrophotometer, being a virtual device, is only described by its geometry.

关键词： Reflectivity Wavelength measurement Geometry computer science Energy measurement Optical reflection Monte Carlo methods Sampling methods Convergence Biology

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Mesh metamorphosis with topology transformations

Mesh metamorphosis with topology transformations

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pacific conference on computer graphics and applications

作者： Minsu Ahn Seungyong Lee Department of Computer Science and Engineering Pohang University of Science and Technology Pohang South Korea

ISBN: (纸本)0769517846

3D mesh morphing based on a metamesh has fundamental limitations of complicated in-between meshes and no topology (connectivity) changes in a metamorphosis. This paper presents a novel approach for 3D mesh morphing, which is not based on a metamesh. The approach simultaneously interpolates the topology and geometry of input meshes. In our approach, an in-between mesh contains only the vertices from the source and target meshes. Since no additional vertices are introduced, the in-between meshes are much simpler than those generated by previous techniques.

关键词： Topology Geometry Interpolation computer science Mesh generation Animation computer graphics Application software

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Advecting procedural textures for 2D flow animation

Advecting procedural textures for 2D flow animation

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pacific conference on computer graphics and applications

作者： D. Kao A. Pang NASA Ames Research Center Moffett Field CA USA Computer Science Department University of California Santa Cruz USA

The paper proposes the use of specially generated 3D procedural textures for visualizing steady state 2D flow fields. We use the flow field to advect and animate the texture over time. However, using standard texture advection techniques and arbitrary textures will introduce some undesirable effects such as: (a) expanding texture from a critical source point, (b) streaking pattern from the boundary of the flow field, (c) crowding of advected textures near an attracting spiral or sink, and (d) absent or lack of textures in some regions of the flow. The paper proposes a number of strategies to solve these problems. We demonstrate how the technique works using both synthetic data and computational fluid dynamics data.

关键词： Animation Spirals NASA Steady-state Layout computer graphics Data visualization Fluid dynamics Computational fluid dynamics Pixel

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Interactive simulation of fire

Interactive simulation of fire

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pacific conference on computer graphics and applications

作者： Z. Melek J. Keyser Computer Science Department Texas A and M University USA

In this paper we describe a fast and interactive model to simulate and control the fire phenomenon. We use a modified interactive fluid dynamics solver to describe the motion of a 3-gas system. We simulate the motion of oxidizing air, fuel gases, and exhaust gases. The burning process is simulated by consuming fuel and air based on the amounts of fuel and air inside each grid cell. By modeling heat distribution, we also simulate the spread of fire to and self-ignition in other combustible solids.

关键词： Fires Fuels Combustion Computational modeling Gases Solid modeling computer science computer simulation Fluid dynamics computer graphics

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Adaptive hierarchical b-spline surface approximation of large-scale scattered data

Adaptive hierarchical b-spline surface approximation of larg...

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pacific conference on computer graphics and applications

作者： Weiqiang Zhang Zesheng Tang Jie Li Department of Computer Science and Technology Tsinghua University Beijing China

ISBN: (纸本)0818686200

A fast algorithm for large scale scattered data approximation is described. The algorithm exploits a coarse-to-fine hierarchical control lattice to fit the scattered data. In this algorithm, the refinement process is only located in the regions where the error between the scattered data and the resulting surface is greater than a specified tolerance. A recursive algorithm is used to find these regions. In order to ensure the C/sup 2/-continuity of the resulting surfaces, we introduce an additional method to get the boundary control points around the subcontrol lattice. Experimental results are included to show that this method can approximate large scale scattered data sets quickly.

关键词： Spline Large-scale systems Scattering Approximation algorithms Lattices Surface fitting

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