摘要
FFD(Free- Form Deform ation)是计算机动画和变形中最重要的方法之一 .FFD的直接操作为变形提供了更直观更方便的控制手段 .该文用约束优化方法 ,通过调整张量积网格控制点对应的权因子 ,解决基于 NURBS的FFD直接操作问题 ,给出了变形物体在单点和多点约束下 FFD直接操作的解 ,使变形后的物体通过给定的目标点 .该方法计算简便 ,易于实现 .文中给出的变形实例也表明 ,变形结果比较自然 .
Free-Form Deformation (FFD) is one of the most important methods in computer animation and deformation. Direct manipulation of FFD improves controllability and efficiency of the deformation. This paper presents a new algorithm of direct manipulation of NURBS-based FFD via changing weights of lattice using constrained optimization method. With this algorithm, the solution of constraints with single and multiple target points can be got, and the deformed shape passes through these given target points naturally. This method involves only simple calculations and is easy to implement. The examples given in the paper also indicate that the deformation is natural.
出处
《计算机学报》
EI
CSCD
北大核心
2002年第9期910-915,共6页
Chinese Journal of Computers
基金
国家自然科学基金 (6990 2 0 0 4)资助
