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Problem with TopExp_Explorer

Yuqian chen's picture
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Hi everyone,

I'm trying to get the common part of two coplanar faces by BRepAlgoAPI_Common and get the faces by TopExp_Explorer, but the depth of the Explorer is always -1, so I cannot get the face by TopExp_Explorer.Current. Here is the code:

commom_shell = BRepAlgoAPI_Common(shell_a, shell_b).Shape()
faces_Exp = TopExp_Explorer(common_shell, OCC.TopAbs.TopAbs_FACE)
depth = faces_Exp.Depth()

Does anyone know, why the depth of a TopExp_Explorer is <0?

Thanks in advance!!!