concave or convex

[hello]

Hello, I would like to know how to determine whether the common edge of two adjacent faces is concave or convex. It is better to be specific to the bottom calculation. Thank you

 

[Quaoar]

You can use this class or code from it: https://gitlab.com/ssv/AnalysisSitus/-/blob/master/src/asiAlgo/features/asiAlgo_CheckDihedralAngle.h