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检索条件"任意字段=Computer Aided Design and Computer Graphics, 2005. Ninth International Conference on"

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Optimal sample patches selection for tile-based texture synthesis

Optimal sample patches selection for tile-based texture synt...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Weiming Dong Shuangxian Sun J.-C. Paul ISA-ALICE INRIA Lorraine France Beijing Jiaotong University China CNRS/Tsinghua University China

One significant problem in tile-based texture synthesis is the selection of sample patches. The reason is that the tiling process may produce results with poor quality when the sample patches used to fill the tiles can not find good cutting patches at the merging stage. In this paper, we use genetic algorithm to find the best group of sample patches from a considerable number of patch groups. Using tile set gene rated by these optimal sample patches can significantly improve the result quality of the tile-based texture synthesis.

关键词： Tiles Genetic algorithms computer graphics Stochastic processes Principal component analysis Sun Merging computer vision Image processing Rendering (computer graphics)

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What order Taylor model is sufficient for subdivision based implicit curve plotting

What order Taylor model is sufficient for subdivision based ...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Huahao Shou Jie Shen D. Yoon Department of Applied Mathematics Zhejiang University of Technology Hangzhou Zhejiang China Department Computer and Information Science University of Michigan Dearborn Dearborn MI USA

In this paper, we conducted some well chosen experimental tests to determine what order is sufficient for Taylor model applied in subdivision based implicit curve plotting algorithm. Test results show that order 1 is sufficient for most test examples with simple expressions, and some more complicated test examples need order 2 or 3. Order 3 is sufficient for all test examples we tested.

关键词： Testing Arithmetic Differential algebraic equations Application software computer graphics Mathematics Information science Mathematical model Computational modeling Physics

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Mesh parameterization for an open connected surface without partition

Mesh parameterization for an open connected surface without ...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Yu-Shen Liu Jun-Hai Yong Pi-Qiang Yu Hui Zhang Ming-Cui Du J.-C. Paul Tsinghua University Beijing China Beijing Jiaotong University China

A novel mesh parametrization method for an open connected surface is presented. The parametrization method is based on Hessian-based locally linear embedding (HLLE). Our method operates directly on the surface without using any partition technique and can preserve the local and global structure, while partition-based methods often produce high distortion and discontinuity nearby partition boundaries. In addition, some examples about texture mapping show the efficiency of our method.

关键词： Mesh generation computer graphics Surface texture Topology Shape Application software Geophysics computing Boundary conditions Nonlinear distortion Multidimensional systems

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Implementation and application of the distributed collaborative design platform based on pattern design

Implementation and application of the distributed collaborat...

引用

international conference on computer Supported Cooperative Work in design

作者： Bin Gong Xiangxu Meng Chenglei Yang School of Computer Science and Technology Shandong University China

ISBN: (纸本)184000025

According to the CSCW cooperative mechanism, this paper presents the implementation of the distributed collaborative design platform based on pattern design, which is an application of CSCW in CAD. The architecture platform and protocol implementation is provided. It also describes the push and pulls functions used to perform data integrity and maintenance consistency. The applications show that the platform has features of CSCW to ensure that it operates well in real world conditions.

关键词： Collaboration design automation Collaborative work Application software computer interfaces computer networks graphics computer science Protocols Communications technology

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Real-time rendering of raining animation based on the graphics hardware acceleration

Real-time rendering of raining animation based on the graphi...

引用

international conference on computer Supported Cooperative Work in design

作者： Zhong-Xin Feng Min Tang Jin-Xiang Dong Shang-Ching Chou College of Computer Science and Technology University of Zhejiang Hangzhou China Department of Computer Science Wichita State University Wichita KS USA

ISBN: (纸本)184000025

We present an efficient method for simulation of raining phenomenon in real time by taking advantage of the parallelism and programmability of GPU (graphic processing unit). Our implementation of the method is based on particle systems and collision detection. Splashing of raindrop is simulated using a series of stylized textures and rotations of point sprites. Taking into account human perception in raining phenomenon of real world, the effects such as light influence, depth of field, motion blur, have been applied. The test results show that our method is efficient and is feasible to solve the problem of 3D raining simulation in real time for more general environment with complex geometry.

关键词： Rendering (computer graphics) Animation graphics Hardware Acceleration Sprites (computer) Humans Testing Solid modeling Geometry

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Fast mesh-free deformations

Fast mesh-free deformations

引用

IEEE international conference on computer-aided design and computer graphics

作者： Jian Chang Xiaosong Yang J.J. Zhang Bournemouth University UK

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： Computational modeling Springs Deformable models Animation computer simulation Large-scale systems Convergence Algorithm design and analysis Power system modeling computer graphics

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Abstract interactions and interaction refinement in model-driven design

Abstract interactions and interaction refinement in model-dr...

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9th IEEE international Enterprise Distributed Object Computing conference

作者： Almeida, JP Dijkman, R Pires, LF Quartel, D van Sinderen, M Univ Twente Ctr Telemat & Informat Technol Enschede Netherlands

ISBN: (纸本)0769524419

In a model-driven design process the interaction between application parts can be described at various levels of platform-independence. At the lowest level of platform-independence, interaction is realized by interaction mechanisms provided by specific middleware platforms. At higher levels of platform-independence, interaction must be described in such a way that it can be further refined and realized onto a number of different middleware platforms, each with its particular interaction mechanisms and implementation constraints. In this paper we investigate concepts that support interaction design at various levels of middleware-platform independence. Also, we propose design operations for interaction refinement. The application of these operations to source designs results in target designs that take into account implementation constraints imposed by platforms, while preserving characteristics prescribed in source designs.

关键词： computer aided design

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The GPU on irregular computing: performance issues and contributions

The GPU on irregular computing: performance issues and contr...

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IEEE international conference on computer-aided design and computer graphics

作者： M. Ujaldon J. Saltz Computer Architecture Department Complejo Tecnologico University of Malaga Malaga Spain Biomedical Informatics Department Ohio State Uinversity Columbus OH USA

The paper describes a set of strategies for mapping irregular codes onto commodity graphics hardware. We start identifying the resources that current GPUs contain for solving indirect array accesses entirely on hardware, like vertices, textures and color tables. We then show how multiple indirections can be mapped onto the graphics pipeline, basically taking advantage of its streaming architecture for sequencing the indirections through subsequent pipeline stages. Our techniques are applied over typical irregular kernels like the sparse matrix-vector multiply and the Euler solver. Execution times on the GeForce Series consistently outperform the Pentium 4 and Athlon 64 processors, with performance depending on floating-point precision.

关键词： Kernel computer graphics Streaming media Pipelines Hardware Computational geometry Rendering (computer graphics) Functional programming Biomedical computing computer architecture

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Adaptive rendering of Catmull-Clark subdivision surfaces

Adaptive rendering of Catmull-Clark subdivision surfaces

引用

IEEE international conference on computer-aided design and computer graphics

作者： Shuhua Lai F.F. Cheng Department of Computer Science University of Kentucky Lexington KY USA

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 fewer polygons in the final rendering process because inscribed approximation usually provides faster convergent rate than circumscribed approximation. The new adaptive rendering method can 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 final rendering process. Therefore it is very fast and memory efficient.

关键词： Surface cracks Rendering (computer graphics) computer graphics Solid modeling computer science Performance evaluation Mesh generation Joining processes Spline design automation

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

Acceleration of regular grid traversals using extended chess...

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IEEE international conference on computer-aided design and computer graphics

作者： A. Es V. Isler METU Tübitak-Bilten Turkey Computer Engineering Department M.E.T.U. Turkey

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 have 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： Acceleration Data structures Ray tracing computer graphics Anisotropic magnetoresistance Concurrent computing Rendering (computer graphics) Process design Algorithm design and analysis Parallel processing

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