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Modelling of smoke flow taking obstacles into account

Modelling of smoke flow taking obstacles into account

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pacific conference on computer graphics and applications

作者： S. Yoshida T. Nishita Department of Information Science University of Tokyo Bunkyo Tokyo Japan

ISBN: (纸本)0769508685

Recently, displaying natural phenomena such as smoke has become a topic of interest in computer graphics. The ability to simulate the complex shapes and motion of the smoke particles is not only important but is also a difficult problem to solve. In this paper, we propose a method of displaying swirling smoke, including the consideration of its passage round obstacles. By using the idea of metaballs, we can easily represent the 3D density distribution of smoke. We solve the physical equation of the flow, and represent the vortices by using the vorticity vector. Therefore, we can make a model of the smoke flow even if there are obstacles in its path.

关键词： Computational modeling Equations Information science computer graphics Shape Computational fluid dynamics Layout Animation Pain Displays

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Rendering natural waters

Rendering natural waters

引用

pacific conference on computer graphics and applications

作者： S. Premoze M. Ashikhmin Department of Computer Science University of Utah USA

ISBN: (纸本)0769508685

Creating and rendering realistic water is one of the most daunting tasks in computer graphics. Realistic rendering of water requires that the sunlight and skylight illumination are correct, the water surface is modeled accurately and that the light transport within water body is properly handled. The paper describes a method for wave generation on a water surface using a physically based approach. The wave generation uses data from the oceanographical observations and it is controlled by intuitive parameters such as wind speed and wind direction. The optical behavior of the water surfaces is complex but is well-described in the ocean science literature. We present a simple and intuitive light transport approach that is easy to use for many different water types such as deep ocean water, muddy coastal water and fresh water bodies. We demonstrate our model for a number of water and atmospheric conditions.

关键词： Rendering (computer graphics) Optical surface waves Sea surface Wind speed Oceans computer graphics Lighting Surface waves Sea measurements Atmospheric modeling

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Rendering iridescent colors appearing on natural objects

Rendering iridescent colors appearing on natural objects

引用

pacific conference on computer graphics and applications

作者： H. Hirayama Y. Yamaji K. Kaneda H. Yamashita Y. Monden Faculty of Engineering Hiroshima University Japan Interdisciplinary Faculty of Science and Engineering Shimane University Japan

ISBN: (纸本)0769508685

Iridescent colors appearing on natural objects, such as the feathers of a hummingbird, surfaces inside seashells, and shells of beetles, are beautiful and impressive. The cause of such iridescent colors is interference of light inside multilayer film structures covering the natural objects. The paper proposes a method for realistically rendering iridescent colors appearing on natural surfaces, taking into account interference of light inside multilayer structures. To render the iridescent colors, we have developed an illumination model for multilayer structures fluctuated through the use of a hypertexture. We also have improved the hypertexture to be able to represent fluctuated parametric curved surfaces. Several examples of iridescent colors on the surfaces of a seashell and a beetle demonstrate the usefulness of the proposed method.

关键词： Nonhomogeneous media Interference Rendering (computer graphics) Optical films Feathers computer graphics Lighting Surface texture Clouds Optical refraction

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Optimized triangle mesh compression using prediction trees

Optimized triangle mesh compression using prediction trees

引用

pacific conference on computer graphics and applications

作者： B. Kronrod C. Gotsman Computer Science Department Technion-Israel Institute of Technology Haifa Israel

Recently, a wealth of algorithms for the efficient coding of 3D triangle meshes have been published. All these focus on achieving the most compact code for the connectivity data. The geometric data, i.e. the vertex coordinates, are then coded in an order induced by the connectivity code, which is probably not optimal. This is a pity, as the geometric portion of the data set dominates the code. We propose a way to optimize the geometry code without sacrificing too much in the connectivity code. In our approach, we achieve approximately two bits/triangle for the connectivity before entropy coding, which is not as good as other published algorithms but certainly not significantly worse. Our approach is based on the parallelogram prediction method for mesh geometry. This method is based on the observation that two adjacent triangles in a typical mesh tend to form a shape similar to a parallelogram. If an algorithm uses a parallelogram prediction method then it should build a traversal structure of triangles covering all vertices. The vertex coordinates are then predicted as the structure is traversed. The cost of this code is then the entropy of the distribution of the vertex prediction errors. Since this entropy is hard to manipulate, the accepted practice is to measure the code's effectiveness in the approximation sense, i.e. as the sum of the lengths of the vertex prediction error vectors. The full version of this paper is available at .

关键词： Costs Geometry Tree graphs Prediction methods Decoding computer science Entropy coding Shape Length measurement Design optimization

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Practical texture mapping on free-form surfaces

Practical texture mapping on free-form surfaces

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pacific conference on computer graphics and applications

作者： Y. Iwakiri Y. Omori T. Kanko Department of Information and Computer Sciences Toyohashi University of Technology Aichi Japan

ISBN: (纸本)0769508685

Concerns the problem of mapping photographic images on to the surface of a 3D object whose geometric data are already known. Although the minimal view selection algorithm of K. Matsushita and T. Kaneko (1999) enables the selection of a minimal number of camera positions, it often results in untextured patches due to camera misalignment: a deviation of actual camera position from the specified position. This paper proposes two new practical algorithms (double and product viewing) to ensure that all the polygons are textured even if there are unavoidable human errors in camera alignment. The performance of the algorithms is evaluated by simulation experiments.

关键词： Surface texture Cameras Geometry Geometrical optics Solid modeling Humans Shape measurement computer errors Computational modeling TV

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Visibility in the presence of occluders with curved boundaries

Visibility in the presence of occluders with curved boundari...

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pacific conference on computer graphics and applications

作者： G. Baciu C. Cheung Chun Yu Computer Science Department Hong Kong University of Science and Technology Hong Kong China

ISBN: (纸本)0769508685

Accurate global visibility information has become essential in global illumination rendering. Combinatorial structures, such as the visibility complex, aspect graphs and the visibility skeleton, are the seeds of a new topic of research motivated by practical problems in computer graphics and global illumination rendering. This is now attracting interest from the computational geometry, combinatorics, CAD and robotics communities. The initial motivation has been to accurately represent shadow boundaries generated by occluding surfaces in the path of light from emitting surfaces (sources) to receiving surfaces (receivers). This article adds to the rich body of research in this field by presenting solutions to the problem of occluders with curved boundaries. This has profound implications in three main areas: (1) the generation, maintenance and search functions associated with the global visibility complex, (2) mesh generation, and (3) global illumination rendering. We present a new visibility complex based on the proposed visibility skeleton. The new visibility complex has been designed to handle not only polygonal elements but also surfaces with curved boundaries. We have found that, even in simple 3D scenes, the new visibility complex generates less polygons in the meshing phase and a more accurate global illumination.

关键词： Lighting Rendering (computer graphics) Skeleton Mesh generation Layout computer graphics Computational geometry Combinatorial mathematics Robots Image generation

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Compression of indoor video sequences using homography-based segmentation

Compression of indoor video sequences using homography-based...

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pacific conference on computer graphics and applications

作者： Tae-Joon Park S. Fleishman D. Cohen-Or D. Lischinski Computer Software Technology Laboratory Electronics and Telecommunications Research Institute South Korea Computer Science Department Tel-Aviv University Israel School of Computer Science and Engineering Hebrew University of Jerusalem Israel

ISBN: (纸本)0769508685

We present a new compression algorithm for video sequences of indoor scenes, or more generally, sequences containing mostly planar and near-planar surfaces. Our approach utilizes edge and optical flow information in order to segment selected keyframes into regions of general shape, such that the motion of each region is predicted well by a planar homography. With this kind of motion prediction, the errors between the predicted intermediate frames and the actual ones are very small, and can be compactly encoded. Our results demonstrate significant improvements in the accuracy of the compressed video sequences, compared to standard general purpose video compression.

关键词： Video sequences Video compression Image coding Layout computer science Image storage Multimedia communication Broadcasting MPEG 4 Standard Transform coding

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Interactive simulation of surgical cuts

Interactive simulation of surgical cuts

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pacific conference on computer graphics and applications

作者： D. Bielser M.H. Gross Computer Science Department ETH Zürich Switzerland

ISBN: (纸本)0769508685

Presents a framework for the interactive simulation of surgical cuts, such as those practiced in surgical treatment. Unlike most existing methods, our framework is based on tetrahedral volume meshes providing more topological flexibility. In order to keep the representation consistent, we apply adaptive subdivision schemes dynamically during the simulation. The detection of collisions between the surgical tool and the tissue is accomplished by using an axis-aligned bounding-box hierarchy which was adapted for deformable objects. For haptic rendering and feedback, we devised a mechanical scalpel model which accounts for the most important interaction forces between the scalpel and the tissue. The relaxation is computed using a localized, semi-implicit ODE (ordinary differential equation) solver. The achieved quality and performance of the presented framework is demonstrated using a human soft-tissue model.

关键词： Surgery Computational modeling Biological tissues Deformable models Humans computer simulation Haptic interfaces Solid modeling Feedback Equations

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A new adaptive density estimator for particle-tracing radiosity

A new adaptive density estimator for particle-tracing radios...

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pacific conference on computer graphics and applications

作者： Wong Kam Wah Department of Computer Science and Information Systems University of Hong Kong Hong Kong China

ISBN: (纸本)0769508685

In particle-tracing radiosity algorithms, energy-carrying particles are traced through an environment for simulating global illumination. Illumination on a surface is reconstructed from particle "hit points" on the surface, which is a density estimation problem (B.W. Silverman, 1986). Several methods can be used to solve this problem, such as the adaptive meshing method (R.F. Tobler et al., 1997), the kernel method (B. Walter et al., 1997), and the orthogonal series estimator (M. Feda, 1996). An orthogonal series estimator is proposed to tackle the problem. In the new method, the appropriate number of terms that should be used in the series is determined adaptively and automatically. Moreover a surface subdivision scheme is combined with the estimator to increase the accuracy of estimation. The new method has several advantages over other existing methods: (1) it requires less memory than the adaptive meshing method; (2) it does not store all the particle-hit points as in the kernel method; (3) it determines automatically how many terms should be used in the orthogonal series; (4) it incorporates surface subdivision to further increase the accuracy of estimation.

关键词： Lighting Kernel computer graphics Histograms Optical scattering Surface reconstruction State estimation computer science Information systems Computational modeling

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TEASAR: tree-structure extraction algorithm for accurate and robust skeletons

TEASAR: tree-structure extraction algorithm for accurate and...

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pacific conference on computer graphics and applications

作者： M. Sato I. Bitter M.A. Bender A.E. Kaufman M. Nakajima Department of Computer Science Tokyo Institute of Technology Japan Department of Computer Science State University of New York Stony Brook USA

ISBN: (纸本)0769508685

We introduce the TEASAR algorithm which is a treestructure extraction algorithm delivering skeletons that are accurate and robust. Volumetric skeletons are needed for accurate measurements of length along branching and winding structures. Skeletons are also required in automatic virtual navigation, such as traveling through human organs (e.g., the colon) to control movement and orientation of the virtual camera. We introduce a concise but general definition of a skeleton, and provide an algorithm that finds the skeleton accurately and rapidly. Our solution is fully automatic, which frees the user from having to engage in data preprocessing. We present the accurate skeletons computed on a number of test datasets. The algorithm is efficient as demonstrated by the running times on a single 194 MHz MIPS R10000 CPU which were all below five minutes.

关键词： Robustness Skeleton Length measurement Volume measurement Navigation Humans Colon Automatic control Cameras Data preprocessing

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