采用单笔画草绘的三维模型编辑方法  

A Method of 3D Model Modification using Freehand Sketch with Single Stroke

作　　者：章菲倩[1] 孙正兴[1] 张尧烨[1] 宋沫飞[1] 

机构地区：[1]南京大学计算机软件新技术国家重点实验室,南京210093

出　　处：《计算机辅助设计与图形学学报》2010年第9期1522-1528,共7页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家"八六三"高技术研究发展计划(2007AA01Z334);国家自然科学基金(69903006;60373065;60721002);教育部新世纪优秀人才资助计划(NCET-04-0460)

摘　　要：为提高三维模型的编辑交互性,提出一种采用单笔画草绘的三维模型编辑方法.该方法根据三维模型轮廓的数学特征,采用基于对象空间的三维模型轮廓提取方法,通过检测三维模型的轮廓点和暗示性轮廓点特征提取简洁清晰的三维模型内外轮廓;再根据用户的纸上绘制习惯,采用基于端点邻近性的笔画匹配方法获取三维模型中待修改的轮廓段.最后根据笔画与待修改轮廓段之间的对应关系对模型形变参数进行计算,采用拉普拉斯形变方法重建三维模型得到形变结果.实验结果表明,文中方法能有效地支持用户对三维模型内外轮廓进行单笔画编辑和修改.A method of 3D model modification using freehand sketch with single stroke is proposed to improve the interactivity of the modification.Firstly,according to the mathematical characteristics of the 3D model,an object-space silhouette detection method is used to extract the concise and clear internal and external silhouettes by detecting the contour points and suggestive contour points.Secondly,an endpoint proximity criterion for stroke matching is introduced to get the part of the silhouettes intended to modify effectively.Finally,based on the correspondence between the stroke and the silhouettes to be modified,deformation parameters are calculated and used in Laplacian surface editing process to rebuild 3D model and finish the modification.The experimental results show that the proposed method enables the users to edit and modify the internal and external contours of the 3D model with single stroke effectively.

关 键 词：三维模型 草图交互 模型编辑 轮廓提取 笔画匹配 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]