保持特征的自适应Loop细分曲面算法及实现

Algorithm and Implementation of Adaptive Loop Subdivision Surfaces for Preserving Sharp Feature

基于Loop细分模式,综合运用生成特征的细分方法和自适应方法等,提出一种计算简便的保持特征的自适应Loop细分曲面生成算法.该算法能够实现自动提取初始网格的尖锐特征,并可以通过交互式方式选择控制尖锐特征边、特征点及相应的尖锐度,同时给出了一种新的顶点平坦度定义.该算法采用自适应方法避免在相对光滑处再细分,提出的顶点平坦度计算简便、高效,能够有效地减少细分生成的网格数量和处理速度.实验表明该算法能较好地生成带半尖锐、尖锐特征的细分曲面.

An efficient generating algorithm for adaptive subdivision surface which preserves sharp feature is posed and analyzed based on Loop subdivision.Sharp feature is automatically tagged,and the sharp edges、sharp vertexes and their sharp degree are selected by interactive method.Besides,a simple calculation method based on flatness definition is put forward in this paper.Using adaptive method avoids to divide the smooth regions.Examples show the effects of sharp and semi-sharp features generated by the algorithm.