基于三角形网格的半尖锐特征造型算法研究

Research semi-sharp features algorithm based on triangle

为了解决基于递归分割的曲面建模方法在实际应用过程中存在的问题,增强递归分割曲面的造型能力,在特征造型方面,利用边界规则实现了递归分割曲面的折痕、尖刺、角等绝对尖锐特征造型;在避免了为构造特殊效果而建立不同的递归分割算法基础上,提出了一种带权值的Loop递归分割算法。通过在初始网格上增加新结点的方式,利用通过不同的权值控制其极限曲面与初始网格的相似程度,减小了网格的收缩,实现了Loop递归分割曲面的半尖锐特征造型。

In order to resolve the problem of recursive-subdivision-based surface modeling in practical application and to enhance the modeling ability of the recursive-subdivision surface, by boundary rules in the feature modeling, the absolutely-sharp feature modeling is gotten such as crease, dart, and corner in the recursive-subdivision surface.On the basis of establishment of different recursive-subdivision algorithm in case of constructing special effect, a weighted loop recursive-subdivision algorithm is proposed.By generation of new vertex in the original mesh and using the way of controlling approximation accuracy between the limit surface and initial mesh through different weighted, mesh shrinkage is reduced, and semi-sharp feature modeling of the loop recursive segmentation surface is obtained.