I konw why this happen now. The normals are in different direction:
<https://lh3.googleusercontent.com/-6OMRqDXwArc/VTiR6VnQGnI/AAAAAAAAA2I/8zZ2KxGTZuo/s1600/Image.png> The normal direction can be changed by following command: Plane Surface("circle") = {*-1*}; 在 2015年4月17日星期五 UTC+8下午11:38:37，[email protected]写道： > > gmsh version: 2.8.5 & 2.9.2 windows > > global size factor: 0.3 > > counter-clock and clockwise triangles are generated at the same time. The > following two triangle are not in the same direction: > > 13 2 2 3 12 *6 20 23* > 14 2 2 3 12 *20 22 23* >
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