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Boundary determination for trivariate solids 7

Boundary determination for trivariate solids

引用

7th pacific conference on computer graphics and applications, pacific graphics 1999

作者： Joy, Kenneth I. Duchaineau, Mark A. Computer Science Department University of California Davis United States Center for Applied Scientific Computing Lawrence Livermore National Laboratory United States

ISBN: (纸本)0769502938

The trivariate tensor-product B-spline solid is a direct extension of the B-spline patch and has been shown to be useful in the creation and visualization of free-form geometric solids. Visualizing these solid objects requires the determination of the boundary surface of the solid, which is a combination of parametric and implicit surfaces. This paper presents a method that determines the implicit boundary surface by examination of the Jacobian determinant of the defining B-spline function. Using an approximation to this determinant, the domain space is adaptively subdivided until a mesh can be determined such that the boundary surface is close to linear in the cells of the mesh. A variation of the marching cubes algorithm is then used to draw the surface. Interval approximation techniques are used to approximate the Jacobian determinant and to approximate the Jacobian determinant gradient for use in the adaptive subdivision methods. This technique can be used to create free-form solid objects, useful in geometric modeling applications. © 1999 IEEE.

关键词： Interpolation

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Making 3D textures practical 7

Making 3D textures practical

引用

7th pacific conference on computer graphics and applications, pacific graphics 1999

作者： Bajaj, Chandrajit Ihm, Insung Park, Sanghun Department of Computer Sciences University of Texas at Austin United States Department of Computer Science Sogang University Korea Republic of

ISBN: (纸本)0769502938

While 2D texture mapping is one of the most powerful rendering techniques that make 3D objects appear visually interesting, it suffers from visual artifacts produced when 2D image patterns are wrapped onto the surface of objects with arbitrary shapes. On the other hand, 3D texture mapping generates highly natural visual effects in which objects appear carved from lumps of materials rather than laminated with thin sheets as in 2D texture mapping. Storing 3D texture images in a table for fast mapping computations, instead of evaluating procedures on the fly, however, has been considered impractical due to the extremely high memory requirements. In this paper, we present a new effective method for 3D texture mapping designed for real-time rendering of polygonal models. Our scheme attempts to resolve the potential texture memory problem arising from the very large size of 3D images by compressing them using a wavelet-based encoding method. The experimental results on various non-trivial 3D textures and polygonal models show that high compression rates are achieved with few visual artifacts in the rendered image and a small impact on rendering time. The simplicity of our compression-based scheme will make it possible to implement practical 3D texture mapping in software/hardware rendering systems including the real-time 3D graphics APIs like OpenGL and Direct3D. © 1999 IEEE.

关键词： Mapping

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Automatic creation of object hierarchies for radiosity clustering 7

Automatic creation of object hierarchies for radiosity clust...

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7th pacific conference on computer graphics and applications, pacific graphics 1999

作者： Muller, Gordon Schafer, Stephan Fellner, Dieter W. Institute of Computer Graphics Technical University of Braunschweig Rebenring 18 BraunschweigD-38106 Germany

ISBN: (纸本)0769502938

Using object clusters for hierarchical radiosity greatly improves the efficiency and thus usability of radiosity computations. By eliminating the quadratic starting phase very large scenes containing about 100 K polygons can be handled efficiently. Although the main algorithm extends rather easily to using object clusters, the creation of »good» object hierarchies is a difficult task both in terms of construction time and in the way how surfaces or objects are grouped to clusters. The quality of an object hierarchy for clustering depends on its ability to accurately simulate the hierarchy of the energy flow in a given scene. Additionally it should support visibility computations by providing efficient ray acceleration techniques. In this paper we present a new approach of building hierarchies of object clusters. Our hybrid structuring algorithm provides accuracy and speed by combining a highly optimized bounding volume hierarchy together with uniform spatial subdivisions for nodes with regular object densities. The algorithm works without user intervention and is well suited for a wide variety of scenes. First results of using these hierarchies in a radiosity clustering environment are very promising and will be presented here. The combination of very deep hierarchies (we use a binary tree) together with an efficient ray acceleration structure shifts the computational effort away from form factor and visibility calculation towards accurately propagating the energy through the hierarchy. We show how an efficient single pass gathering can be used to minimize traversal costs. © 1999 IEEE.

关键词： Binary trees

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A speech driven talking head system based on a single face image 7

A speech driven talking head system based on a single face i...

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7th pacific conference on computer graphics and applications, pacific graphics 1999

作者： Lin, I-Chen Hung, Cheng-Sheng Yang, Tzong-Jer Ouhyoung, Ming Communication and Multimedia Laboratory Dept. of Computer Science and Information Engineering National Taiwan University Taipei106 Taiwan

ISBN: (纸本)0769502938

In this paper, a lifelike talking head system is proposed. The talking head, which is driven by speaker independent speech recognition, requires only one single face image to synthesize lifelike facial expression. The proposed system uses speech recognition engines to get utterances and corresponding time stamps in the speech data. Associated facial expressions can be fetched from an expression pool and the synthetic facial expression can then be synchronized with speech. When applied to Internet, our web-enabled talking head system can be a vivid merchandise narrator, and only requires 50 K bytes/minute with an additional face image (about 40 Kbytes in CIF format, 24 bit-color, JPEG compression). The system can synthesize facial animation more than 30 frames/sec on a Pentium II 266 MHz PC. © 1999 IEEE.

关键词： Speech recognition

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Efficient region-selective subdivision for 3-D meshes 33

Efficient region-selective subdivision for 3-D meshes

引用

33rd Asilomar conference on Signals, Systems, and computers, ACSSC 1999

作者： Dong, Wenlong Li, Jiankun Kuo, C.-C. Jay Department of Electrical Engineering-Systems Integrated Media Systems Center University of Southern California Los AngelesCA90089-2564 United States

ISBN: (纸本)0780357000

An efficient region-selective subdivision algorithm for 3-D meshes is proposed in this research, The use of subdivision surfaces for constructing and representing 3-D objects has been introduced in computer graphics and related fields. As an interpolating subdivision scheme on triangular meshes, the modified butterfly subdivision (MBS) algorithm is feasible for many applications such as progressive rendering and object shape-preserving. To further improve MBS, we adopt efficient refinement criteria based on the viewing frustum, the surface orientation, the screen-space visibility error and the local mesh flatness. We also provide a set of subdivision rules to model some natural sharp features such as local creases, cusps and darts. By choosing appropriate edges as being sharp, the refined meshes attain desired sharp features in edge regions, while maintaining the same order of smoothness as other subdivision algorithms elsewhere. © 1999 IEEE.

关键词： Three dimensional computer graphics

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Science of computer graphics

Science of computer graphics

引用

pacific conference on computer graphics and applications

作者： T.L. Kunii Hosei University Koganei Tokyo Japan

computer graphics lacks scientific foundation to make it an academic discipline. Science has been in search of invariants through various changes to identify the scientific truth to build theories on the invariants. A hierarchy of invariants is presented for computer graphics having cellular spatial structures as the core. Same application examples are shown for illustrative purposes.

关键词： computer graphics Fiber reinforced plastics

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Modeling and rendering methods of clouds

Modeling and rendering methods of clouds

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pacific conference on computer graphics and applications

作者： T. Nishita Y. Dobashi University of Tokyo Bunkyo Tokyo Japan Hiroshima City University Hiroshima Japan

Recently, simulation of natural phenomena, such as water, smokes, fire, clouds, have been attempted in computer graphics. Clouds play an important role when generating images of outdoor scenes, the earth viewed from outer space and the visualization of weather information. This paper describes the modeling methods of clouds, and an efficient calculation method for light scattering due to clouds taking into account both multiple scattering and sky light. The methods discussed here are also useful for displaying snow.

关键词： Clouds Light scattering Rendering (computer graphics) Computational modeling computer simulation Fires computer graphics Image generation Layout Earth

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Volumetric modeling of colored pencil drawing

Volumetric modeling of colored pencil drawing

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pacific conference on computer graphics and applications

作者： S. Takgi I. Fujishiro M. Nakajima Dept. of Comput. Sci. Tokyo Inst. of Technol. Japan Department of Information Sciences Ochanomizu University Bunkyo Tokyo Japan Department of Computer Science Tokyo Institute of Technology Meguro Tokyo Japan

Not only photorealistic rendering but non-photorealistic rendering is considered an important research topic in artistic image synthesis. However, little attention has been given to colored pencil drawing. This paper proposes a volume graphics model for colored pencil drawing. The model consists of three sub-models, which describe in a volumetric fashion, the microstructure of paper, pigment distribution on paper, and pigment redistribution, respectively. The model takes advantage of volumetric offset distance accessibility and line integral convolution, and thus is highly controllable with a small number of parameters. A couple of synthesized color pencil drawing data sets are rendered using an existing volume visualizer to empirically prove that the model is descriptive enough to produce realistic images of colored pencil drawing.

关键词： Pigmentation Painting Rendering (computer graphics) Eyes computer science Image generation graphics Microstructure Data visualization Petroleum

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VISBONE: 3D visualization of bone mineral density

VISBONE: 3D visualization of bone mineral density

引用

pacific conference on computer graphics and applications

作者： Yi-King Choi J.C.Y. Leong W.W. Lu Weuping Wang Department of Computer Science and Information Systems University of Hong Kong Hong Kong China Department of Orthopaedic Surgery University of Hong Kong Hong Kong China

Volume visualization is an essential part of many computer-assisted medical applications. While general-purpose commercial visualization software can provide common functions for visualizing three-dimensional (3D) medical data, there are many occasions where specific requirements cannot be fulfilled by such software. In orthopaedic surgery involving screw insertion, surgeons must consider not only the surface topology but also the bone mineral density (BMD) distribution to ensure a high success rate of the operation. In this paper we present a new system, called VISBONE, for visualizing the 3D BMD distribution within a bone. Design issues and specific considerations required by this application are discussed.

关键词： Bones Minerals Fasteners Orthopedic surgery Biomedical imaging Data visualization Computed tomography computer science Information systems computer applications

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Subdivision surface fitting to a range of points

Subdivision surface fitting to a range of points

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pacific conference on computer graphics and applications

作者： H. Suzuki S. Takeuchi T. Kanai Tokyo Daigaku Bunkyo-ku Tokyo JP

The objective of this research is to apply the subdivision surface for surface fitting problems when generating surfaces from data points or polyhedral models. The basic idea is to use the subdivision limit position (SLP) to adapt the control mesh of the subdivision surface to the data points. This method is not a time consuming process involving global optimization. It does, however, fail to capture local characteristics of data points. Consequently, the proposed method is not suitable for generating a surface that precisely interpolates the data points, but it will be useful for quickly generating a surface that captures the overall shape constituted by the data points. A prototype system hers been developed to demonstrate several examples for purposes of evaluating the proposed method.

关键词： Surface fitting Spline Prototypes Precision engineering Optimization methods Shape computer graphics Solid modeling Interpolation Animation

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