Semi-stationary subdivision operators in geometric modeling

来源 :自然科学进展 | 被引量 : 0次 | 上传用户:bruce_8_8_8
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Based on the view of operator, a novel uniform subdivision construction method is proposed for free form curve and surface design. This method can give an appropriate manner of parameter change in the subdivision iteration with fewer parameters and better shape control, such as building local revolving surfaces. The convergent property of order 2 subdivision surface is elegantly analyzed using computing techniques of matrix. This method is promised to be valuable in Computer Aided Design and computer graphics, due to the simplicity both in mathematical theory and practical implementation, the similarity to the B-spline curve and surface, G1 continuity, the affine invariability and local flexible control.
其他文献
Soil wind erosion in the semiarid steppe area was studied using the 137Cs tracing technique. Comparisons of 137Cs deposition characteristics between different s
For rational integers γ and λ, consider two families of (-1) and (-3) respectively. General formulae expressed by Weierstrass -functions are given for special
本文针对目前我国的交叉路口多,车流量大,交通较为混乱的现象,重点研究了如何利用ZigBee技术来搭建无线传感器网络,并最终实现基于无线传感器的交通信息采集系统设计。本文根据智
随着钢结构的广泛应用,技术难度会越来越大,质量问题也会愈来愈受关注。钢结构的精度要求高,因此,过程中的质量控制十分必要,一定要切实有效的抓好各个环节的控制,这样才能有效的提
利用在束γ谱学方法,通过反应144Sm(28Si,1p3n)169Re研究了169Re的激发态能级结构. 实验进行了X-γ符合、γ-γ符合、DCO系数和带内B(M1)/B(E2)比率测量. 基于这些测量,建立
In linear mixed models, there are two kinds of unknown parameters: one is the fixed effect, theother is the variance component. In this paper, new estimates of
The Lyapunov exponents of synchronous 12-lead ECG signals have been investigated for the first time using a multi-sensor (electrode) technique. The results show
文章通过试验研究,确认了骨架密实型水泥稳定碎石基层这一工艺的可行性,并成功运用于路面基层,经过一系列的试验研究,确定了最佳的配合比及施工工艺,为密实型水泥稳定碎石基
Based on careful sampling and accurate analysis of recent sediments in Lake Chenghai, this paper discusses the staggered positive/negative correlation between o
文章介绍了发电车柴油机24 V启动电池放亏后所造成的危害,分析了24 V启动电池放亏的主要原因,提出对启动电源线检修卡控,提高充电装置检修质量,加装48V转24V应急转换装置,改