参数化模型到直接建模的模型转换方法

摘要

参数化建模和直接建模方法是当前主流的两种三维几何建模方法,两者在功能上有较强的互补性.为了实现两种模型之间的转换,更好地体现设计者的设计意图,提高设计效率,提出了基于曲面重构的转换方法.通过对参数化模型表面点集做Delaunay三角剖分,求解出模型表面几何方程,拟合重构出直接建模模型,并以包含特征信息的三角网格单元的跟踪标记和数据更新来实现直接建模操作.实验表明,该转换方法适用于大多数特征模型的转换,且具有较高的转换效率.%Currently,parametric modeling and direct modeling were two main methods of 3D geo-metric modeling,these methods had strong complementary on the functions.In view of how to realize the conversion between them,to reflect designers'intentions better,and to improve design efficiency, a method was proposed herein based on surface reconstruction.In order to restructure the parameter-ized model,the method needed to do a Delaunay triangulation by the points from parameterized model surface,and the direct modeling operation was realized by tracking tag and data update of the triangu-lar mesh elements which contained feature informations.Finally,experimental results show that the proposed method is suitable for most feature models with a high conversion efficiency.