中文摘要：

在三维计算的基础上针对三维颅面模型，提出了一种基于几何特征的三维模型变形与编辑算法。该算法采用迭代过程，即每进行一次变形便可以重新计算调整后的颅面几何特征值，如果满足需要则退出编辑并保存模型；否则继续变形，直到得到满意的三维模型为止。在局部变形中，为了弥补自由变形技术在变形控制和用户交互方面的不足，对点约束局部变形算法进行了改进。实验证明，该算法实现简单，且具有良好的交互性，变形效果良好。

英文摘要：

This paper presented a deformation and edition algorithm based on 3 D calculation for 3 D craniofaeial model. The algorithm iteratively calculated feature geometric parameters of face after each deform. When requirement was fitted, it broke and stored model ; or else the algorithm kept going on until model deforms to satisfying result. In order to improve the technique of free-form deformation in flexibility of user interaction and modification, improved the algorithm of point constrained deforma- tion. Experiments show that this approach is straightforward, interactive easily and can achieve good results.