th The 24 Computer Graphics International Conference (CGI 2006) was held during June 26–28, 2006, in Hangzhou, China. This volume contains 39 full papers and 39 short papers accepted by CGI 2006. CGI conference was initially founded by the Computer Graphics Society in 1983 and has now become a widely recognized, high-quality academic conference in the field of computer graphics. Recent CGI conferences were held in New York (2005), Crete (2004), Tokyo (2003), Bradford (2002), Hong Kong (2001) and Geneva (2000). The CGI 2006 Program Committee received an overwhelming 387 submissions from many countries worldwide. China and Korea contributed many enthusiastic submissions. Based on the strict review comments of international experts, we selected 38 full papers and 37 short papers for presentations. The main topics covered by the papers in this volume include: • Digital geometry processing and meshes • Physically based animation • Figure modeling and animation • Geometric computing and processing • Non-photorealistic rendering • Image-based techniques • Visualization We are grateful to all the authors who submitted their papers to CGI 2006, to the international Program Committee members and external reviewers for their valuable time and effort spent in the review process, and members of the Organizing Committee for their hard work which made this conference successful. Finally, we would like to thank the National Natural Science Foundation of China and K. C. Wong Education Foundation, Hong Kong, for their financial support.

th The 24 Computer Graphics International Conference (CGI 2006) was held during June 26–28, 2006, in Hangzhou, China. This volume contains 39 full papers and 39 short papers accepted by CGI 2006. CGI conference was initially founded by the Computer Graphics Society in 1983 and has now become a widely recognized, high-quality academic conference in the field of computer graphics. Recent CGI conferences were held in New York (2005), Crete (2004), Tokyo (2003), Bradford (2002), Hong Kong (2001) and Geneva (2000). The CGI 2006 Program Committee received an overwhelming 387 submissions from many countries worldwide. China and Korea contributed many enthusiastic submissions. Based on the strict review comments of international experts, we selected 38 full papers and 37 short papers for presentations. The main topics covered by the papers in this volume include: • Digital geometry processing and meshes • Physically based animation • Figure modeling and animation • Geometric computing and processing • Non-photorealistic rendering • Image-based techniques • Visualization We are grateful to all the authors who submitted their papers to CGI 2006, to the international Program Committee members and external reviewers for their valuable time and effort spent in the review process, and members of the Organizing Committee for their hard work which made this conference successful. Finally, we would like to thank the National Natural Science Foundation of China and K. C. Wong Education Foundation, Hong Kong, for their financial support.

This book is a result of the lectures and discussions during the conference "Theory and Practice of Geometric Modeling". The event has been organized by the Wilhelm-Schickard-Institut fiir Informatik, Universitat Tiibingen and took place at the Heinrich-Fabri-Institut in Blaubeuren from October 3 to 7, 1988. The conference brought together leading experts from academic and industrial research institutions, CAD system developers and experien­ ced users to exchange their ideas and to discuss new concepts and future directions in geometric modeling. The main intention has been to bridge the gap between theoretical results, performance of existing CAD systems and the real problems of users. The contents is structured in five parts: A Algorithmic Aspects B Surface Intersection, Blending, Ray Tracing C Geometric Tools D Different Representation Schemes in Solid Modeling E Product Modeling in High Level Specifications The material presented in this book reflects the current state of the art in geometric modeling and should therefore be of interest not only to university and industry researchers, but also to system developers and practitioners who wish to keep up to date on recent advances and new concepts in this rapidly expanding field. The editors express their sincere appreciation to the contributing authors, and to the members of the program committee, W. Boehm, J. Hoschek, A. Massabo, H. Nowacki, M. Pratt, J. Rossignac, T. Sederberg and W. Tiller, for their close cooperation and their time and effort that made the conference and this book a success.

This book is a result of the lectures and discussions during the conference "Theory and Practice of Geometric Modeling". The event has been organized by the Wilhelm-Schickard-Institut fiir Informatik, Universitat Tiibingen and took place at the Heinrich-Fabri-Institut in Blaubeuren from October 3 to 7, 1988. The conference brought together leading experts from academic and industrial research institutions, CAD system developers and experien­ ced users to exchange their ideas and to discuss new concepts and future directions in geometric modeling. The main intention has been to bridge the gap between theoretical results, performance of existing CAD systems and the real problems of users. The contents is structured in five parts: A Algorithmic Aspects B Surface Intersection, Blending, Ray Tracing C Geometric Tools D Different Representation Schemes in Solid Modeling E Product Modeling in High Level Specifications The material presented in this book reflects the current state of the art in geometric modeling and should therefore be of interest not only to university and industry researchers, but also to system developers and practitioners who wish to keep up to date on recent advances and new concepts in this rapidly expanding field. The editors express their sincere appreciation to the contributing authors, and to the members of the program committee, W. Boehm, J. Hoschek, A. Massabo, H. Nowacki, M. Pratt, J. Rossignac, T. Sederberg and W. Tiller, for their close cooperation and their time and effort that made the conference and this book a success.

th The 24 Computer Graphics International Conference (CGI 2006) was held during June 26–28, 2006, in Hangzhou, China. This volume contains 39 full papers and 39 short papers accepted by CGI 2006. CGI conference was initially founded by the Computer Graphics Society in 1983 and has now become a widely recognized, high-quality academic conference in the field of computer graphics. Recent CGI conferences were held in New York (2005), Crete (2004), Tokyo (2003), Bradford (2002), Hong Kong (2001) and Geneva (2000). The CGI 2006 Program Committee received an overwhelming 387 submissions from many countries worldwide. China and Korea contributed many enthusiastic submissions. Based on the strict review comments of international experts, we selected 38 full papers and 37 short papers for presentations. The main topics covered by the papers in this volume include: • Digital geometry processing and meshes • Physically based animation • Figure modeling and animation • Geometric computing and processing • Non-photorealistic rendering • Image-based techniques • Visualization We are grateful to all the authors who submitted their papers to CGI 2006, to the international Program Committee members and external reviewers for their valuable time and effort spent in the review process, and members of the Organizing Committee for their hard work which made this conference successful. Finally, we would like to thank the National Natural Science Foundation of China and K. C. Wong Education Foundation, Hong Kong, for their financial support.

th The 24 Computer Graphics International Conference (CGI 2006) was held during June 26–28, 2006, in Hangzhou, China. This volume contains 39 full papers and 39 short papers accepted by CGI 2006. CGI conference was initially founded by the Computer Graphics Society in 1983 and has now become a widely recognized, high-quality academic conference in the field of computer graphics. Recent CGI conferences were held in New York (2005), Crete (2004), Tokyo (2003), Bradford (2002), Hong Kong (2001) and Geneva (2000). The CGI 2006 Program Committee received an overwhelming 387 submissions from many countries worldwide. China and Korea contributed many enthusiastic submissions. Based on the strict review comments of international experts, we selected 38 full papers and 37 short papers for presentations. The main topics covered by the papers in this volume include: • Digital geometry processing and meshes • Physically based animation • Figure modeling and animation • Geometric computing and processing • Non-photorealistic rendering • Image-based techniques • Visualization We are grateful to all the authors who submitted their papers to CGI 2006, to the international Program Committee members and external reviewers for their valuable time and effort spent in the review process, and members of the Organizing Committee for their hard work which made this conference successful. Finally, we would like to thank the National Natural Science Foundation of China and K. C. Wong Education Foundation, Hong Kong, for their financial support.

This book is a result of the lectures and discussions during the conference "Theory and Practice of Geometric Modeling". The event has been organized by the Wilhelm-Schickard-Institut fiir Informatik, Universitat Tiibingen and took place at the Heinrich-Fabri-Institut in Blaubeuren from October 3 to 7, 1988. The conference brought together leading experts from academic and industrial research institutions, CAD system developers and experien­ ced users to exchange their ideas and to discuss new concepts and future directions in geometric modeling. The main intention has been to bridge the gap between theoretical results, performance of existing CAD systems and the real problems of users. The contents is structured in five parts: A Algorithmic Aspects B Surface Intersection, Blending, Ray Tracing C Geometric Tools D Different Representation Schemes in Solid Modeling E Product Modeling in High Level Specifications The material presented in this book reflects the current state of the art in geometric modeling and should therefore be of interest not only to university and industry researchers, but also to system developers and practitioners who wish to keep up to date on recent advances and new concepts in this rapidly expanding field. The editors express their sincere appreciation to the contributing authors, and to the members of the program committee, W. Boehm, J. Hoschek, A. Massabo, H. Nowacki, M. Pratt, J. Rossignac, T. Sederberg and W. Tiller, for their close cooperation and their time and effort that made the conference and this book a success.

This book is a result of the lectures and discussions during the conference "Theory and Practice of Geometric Modeling". The event has been organized by the Wilhelm-Schickard-Institut fiir Informatik, Universitat Tiibingen and took place at the Heinrich-Fabri-Institut in Blaubeuren from October 3 to 7, 1988. The conference brought together leading experts from academic and industrial research institutions, CAD system developers and experien­ ced users to exchange their ideas and to discuss new concepts and future directions in geometric modeling. The main intention has been to bridge the gap between theoretical results, performance of existing CAD systems and the real problems of users. The contents is structured in five parts: A Algorithmic Aspects B Surface Intersection, Blending, Ray Tracing C Geometric Tools D Different Representation Schemes in Solid Modeling E Product Modeling in High Level Specifications The material presented in this book reflects the current state of the art in geometric modeling and should therefore be of interest not only to university and industry researchers, but also to system developers and practitioners who wish to keep up to date on recent advances and new concepts in this rapidly expanding field. The editors express their sincere appreciation to the contributing authors, and to the members of the program committee, W. Boehm, J. Hoschek, A. Massabo, H. Nowacki, M. Pratt, J. Rossignac, T. Sederberg and W. Tiller, for their close cooperation and their time and effort that made the conference and this book a success.