基于特征线的三维模型孔洞修复方法

The repair methods for hole of three-dimensional model based on feature lines

三维模型的孔洞修复是数字几何处理中的一个重要问题.首先利用耳切三角化技术,提出了针对三维模型孔洞的一种基曲面构建方法.然后利用孔洞周围探测得到的特征线的信息来恢复孔洞区域的细节.对于孔洞区域的三角形,根据特征线确定的细分顺序进行细分.细分方法是利用三角形的邻域点的信息和特征线的信息拟合二次曲面,再将三角形的重心投影到拟合的二次曲面上.实验表明:基于特征线的修复方法能够较好地捕获模型的全局特征,并能够有效恢复孔洞区域的显著几何特征,从而获得较自然的修复效果.

The repair method for hole of three-dimensional model is an important quesiton in the area of 3D digital geometry processing. A surface-based construction method for 3D model is presented in this paper based on the technique of ear clipping triangulation. The characterisitic lines detected from the region around the hole are used to recover the details of the hole area. According to the order of the feature line, the triangular region of the hole will be subdivided. The subdivided method takes advantage of the information of adjacent points in the triangle region and the information of feature lines to fit conicoid. Then the center of gravity of the triangle is projected onto the fitted conicoid. The experiment results shows that this method based on feature lines can capture the global structure of the model and recover the salient geometric features in the hole patch in a natural way.