STL文件的法向量错误修复.

In order to repair the normal vector error in STL file,this paper first classified the contours surrounded by the triangular facets with normal vector error into three types,respectively single closed contour,linked closed contours and nested closed contours. Then it repaired the normal vector error as follows: found the border edges of all the facets with normal vector error,found the closed contours formed by the border edges,marked the facets inside the contours,and reversed the direction of the normal vector of each facet inside the contour. It implemented and verified this algorithm by examples. The method proposed in this paper can be used in error detection and repair with STL file. [ABSTRACT FROM AUTHOR]