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共 192 条记录，以下是21-30 订阅

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Fast mesh-free deformations

Fast mesh-free deformations

引用

9th international conference on computer aided design and computer graphics

作者： Chang, J Yang, XS Zhang, JJ Bournemouth Univ Poole BH12 5BB Dorset England

ISBN: (纸本)0769524737

Mesh-free deformation is an effective method for the simulation of deformable objects and characters in computer animation. It bears the merits of flexible control, good accuracy and easy implementation. Similar to other physically-based deformation techniques, however, computational cost remains a pressing issue, especially for large scale problems. Based on our previous work, in this paper we investigate the underlying structure of the numerical approach in order to speed up the computation. Three algorithms are presented and their efficiency and convergence are analysed Our results show that we are able to significantly reduce the computation time and memory usage with little loss in accuracy. The new technique is capable of achieving interactive frame rates with large models.

关键词： deformation mesh-free computer animation physically-based modeling

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Detecting and visualizing local bifurcations in 2D time-dependent vector fields

Detecting and visualizing local bifurcations in 2D time-depe...

引用

9th international conference on computer aided design and computer graphics, CAD/CG 2005

作者： Guanjie, Yang Keqin, Wu Haixia, Shang Department of Computer Science Ocean University of China Qingdao 266071 China

ISBN: (纸本)0769524737

In this paper, we present a new approach to detecting, locating and visualizing the local bifurcations originated from the changes of critical points in a 2D time-dependent vector field. Via precisely tracking the changes of all the critical points in a flow and pictorially displaying the evolution paths of these changes with a color model, our method can find and visualize all of this kind of bifurcations. This work extends Theisel's research on detecting a few local bifurcations based on the feature flow fields, and provides more complete information for probing into the structural instability in complex flow fields. © 2005.IEEE.

关键词： computer graphics

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Adaptive refinement scheme for subdivision surfaces based on triangular meshes

Adaptive refinement scheme for subdivision surfaces based on...

引用

9th international conference on computer aided design and computer graphics, CAD/CG 2005

作者： Jianhuang, Wu Weijun, Liu Tianran, Wang Advanced Manufacture Lab. Graduate School of Chinese Academy of Sciences Chinese Academy of Sciences Shenyang 110016 China

ISBN: (纸本)0769524737

One problem in subdivision surfaces is the number of facets grows exponentially with the level of subdivision. Subdivision schemes are cost intensive at higher levels of subdivision. In this paper, we propose an adaptive subdivision scheme for subdivision surfaces based on triangular meshes and exploit the local smoothness information of a surface for adaptive refinement of a model. With this approach, we can avoid unnecessary subdivision in relative smooth areas and represent surfaces with lower cost when compared with those obtained by uniform subdivision schemes. We compare our methods for various 3D graphic meshes and present our results. © 2005.IEEE.

关键词： computer graphics

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A new approach of progressive spherical parameterization

A new approach of progressive spherical parameterization

引用

9th international conference on computer aided design and computer graphics, CAD/CG 2005

作者： Haishan, Tian Yuanjun, He Yong, Wu Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)0769524737

Parameterization of 3D mesh plays an important role in computer graphics application society, such as geometry compression, texture mapping, morphing and so on. As far as closed two-manifold genus-0 meshes are concerned, natural choice of parameterization domain is sphere, and the basic challenges are no-foldover and low-distortion respectively. To solve the spherical parameterization problem, we present spherical-domain hybrid stretch metric (SHSM), The concept of global area is introduced into SHSM to further reduce the area distortion of parameterized triangles. We demonstrate the ability of our method to both parameterize fast and avoid high distortion, realizing parameterization from the spatial genus-0 meshes onto the unit sphere. © 2005.IEEE.

关键词： computer graphics

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Adaptive rendering of Catmull-Clark subdivision surfaces

Adaptive rendering of Catmull-Clark subdivision surfaces

引用

9th international conference on computer aided design and computer graphics

作者： Lai, SH Cheng, FH Univ Kentucky Graphics & Geometr Modeling Lab Dept Comp Sci Lexington KY 40506 USA

ISBN: (纸本)0769524737

In this paper we present a new adaptive rendering method for general Catmull-Clark subdivision surfaces. The new method is based on direct evaluation of the limit surface to generate an inscribed polyhedron of the limit surface. The method generates less polygons in the filial rendering process because inscribed approximation usually provides faster convergent rate than circumscribed approximation. The new adaptive rendering method call precisely measure error for every point of the limit surface. Hence, it has complete control of the accuracy of the rendering result. Cracks are avoided by using a recursive marking process to ensure that adjacent patches or subpatches use the same limit surface points in the construction of the shared boundary. The new method performs limit surface evaluation only at points that are needed for the filial rendering process. Therefore it is very fast and memory efficient.

关键词： computer graphics

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A method for information protection in collaborative assembly design

A method for information protection in collaborative assembl...

引用

9th international conference on computer aided design and computer graphics, CAD/CG 2005

作者： Hui, Xue Jie, Li State Key Laboratory of CAD and CG Zhejiang University China Dept. of Computer Science Drexel University United States

ISBN: (纸本)0769524737

Information security and assurance are emerging frontiers for collaborative design. The collaborative assembly design becomes one style of cooperation in both design and the outsourcing manufacture. However, during this process, some sensitive information that is secret to certain cooperators is at the risk of leakage. IA is of high need in this process. In this paper, we propose a method that provides the ability to hide the sensitive information while releasing the necessary information for the collaborative assembly design and the outsourcing manufacture. Taking the B-rep model as the original input directly, this method provides the solution of information protected model also in B-rep. Moreover, a prototype system SSDSCA carrying out this method has been implemented. © 2005.IEEE.

关键词： computer supported cooperative work

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GPU-based real-time simulation and rendering of unbounded ocean surface

GPU-based real-time simulation and rendering of unbounded oc...

引用

9th international conference on computer aided design and computer graphics

作者： Yang, XD Pi, XX Zeng, L Li, SK Natl Univ Def Technol Sch Comp Changsha 410073 Peoples R China

ISBN: (纸本)0769524737

We present a multi-resolution mesh model of the ocean surface based on a straightforward terrain LOD scheme, Tiled Quad-tree, with that the region of ocean surface can be extended limitlessly and readily adapted for GPU acceleration. We have introduced the concept of Wrapped Fractal Surface (WFS) for generating height field map of the ocean. Through WFS self-mapping, we can create a series of WFS and obtain the height field map at discrete times without repeating tiles. By interpolating the height map at regular intervals we can build an ocean surface continuously and dynamically. This paper also studied shallow ocean waves concerned about affects of seaboard and underwater terrain. Experimental results showed that our approach was effective and would satisfy the requirements of a realistic real-time navigation for large-scale seascape.

关键词： computer graphics

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Acceleration of regular grid traversals using extended chessboard distance transformation on GPU

Acceleration of regular grid traversals using extended chess...

引用

9th international conference on computer aided design and computer graphics

作者： Es, A Isler, V Tübitak-Bilten METU Turkey METU Computer Engineering Dept. Turkey

ISBN: (纸本)0769524737

In the recent years graphics Processing Units (GPU) have evolved into general purpose programmable streaming parallel processors. This evolution makes it possible to implement high quality photo realistic rendering techniques on graphics processors. There has been a few studies to show how to map ray tracing to the GPU Since graphics processors are not designed to process complex data structures, it is crucial to explore data structures and algorithms for efficient stream processing. In particular ray traversal is one of the most time consuming parts of ray tracing methods. In this work we focus on the efficient ray traversals on GPU. Several known techniques have been redesigned and adapted to the GPU programming model. Also a new traversal method based on extended anisotropic chessboard distance metric has been introduced

关键词： coprocessors parallel processing ray tracing rendering (computer graphics) GPU anisotropic chessboard distance metric chessboard distance transformation general purpose programmable streaming parallel processors graphics processing units photo realistic graphics Processing Unit Ray tracing Coprocessors PARALLEL PROCESSING (computerS) Rendering (computer graphics) acceleration distance transform Data structures

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The curve-structure invariant moments for shape analysis and recognition

The curve-structure invariant moments for shape analysis and...

引用

9th international conference on computer aided design and computer graphics, CAD/CG 2005

作者： Zongmin, Li Jan, Zhang Yujie, Liu Hua, Li School of Computer Science and Communication Engineering University of Petroleum Shandong 257061 China Institute of Computing Technology Chinese Academy of Science Beijing 100080 China

ISBN: (纸本)0769524737

This correspondence addresses the problem of rotation, scale, and translation invariant recognition of images. Object shape comparability is a challenging problem in the field of pattern recognition and computer vision. The method based on the geometric moment invariants is the typical method in these applications. This paper introduces curve structure moment invariants based on the geometric moment invariants from transforming the density in geometric moments into a new density. The difference in the shapes is increased by using the curve structure moment invariants. Therefore, this method can be used in object shape analysis. To support our new theory, an algorithm for object shape analysis is designed and experiments based on square transform are conducted. Experiments give an encouraging high recognition rate by using the curve structure moment invariants. © 2005.IEEE.

关键词： computer graphics

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Mesh simplification and adaptive LOD for finite element mesh generation

Mesh simplification and adaptive LOD for finite element mesh...

引用

9th international conference on computer aided design and computer graphics

作者： Date, H Kanai, S Kishinami, T Nishigaki, I Hokkaido Univ Sapporo Hokkaido 060 Japan

ISBN: (纸本)0769524737

In this paper, we propose a new triangular finite element mesh generation method based on simplification of high-density mesh and adaptive Level-of-Detail (LOD) methods for efficient CAE. Mesh simplification evaluating mesh properties is applied to control the mesh properties required for FE mesh, such as the number of triangular elements, element shape quality and size while keeping the specified approximation tolerance. Adaptive LOD methods based on vertex hierarchy according to curvature and region of interest, and global LOD method preserving density distributions are also proposed in order to construct a more appropriate FE mesh. These methods enable efficient generation of FE meshes with appropriate properties for analysis from a high-density mesh. Finally, the effectiveness of our approach is shown through evaluations of the FE meshes for practical use.

关键词： computer aided engineering mesh generation adaptive level-of detail methods mesh simplification triangular finite element mesh generation mesh generation Medical Subject Headings simplification

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