Why face normal is wrong?

Grasshopper Developer
1

in front and right view，the mesh face normal is wrong。BUT in top view the mesh face normal is right。when i use rebuild mesh tool ,everything is ok。why,Is there a problem with the face normal tool algorithm in grasshopper?

WeChatdd2c44ce45c7fdf98b53b0d4d3a3b938
WeChatdd2c44ce45c7fdf98b53b0d4d3a3b9381920×907 113 KB

WeChat3e73d7010bbeeb7547652763abb2def4
WeChat3e73d7010bbeeb7547652763abb2def41920×1024 125 KB

WeChatdf59f1b6e587e758fe45a1fbffa9f841
WeChatdf59f1b6e587e758fe45a1fbffa9f8411920×868 102 KB

2

hi @chenjiajin thanks for reporting, I can reproduce this
RH-79729 Mesh Sphere Ex wrong normals

3

thank you very much