I am trying to find out the normal vectors in two planar surfaces. These surfaces construct the end parts of a blade turbine models (the uploaded image). Apparently, the surfaces normals are (-1,0,0) for the first one and (1,0,0) for the second.
The BRepLProp_SLProps.Normal() function responds (-1,0,0) for both of them. I checked these faces orientation and both of them were TopABS_FORWARD.
I've seen lots of threads in this topic but not a definite solution has been suggested by now. Is this a bug in OCC?
Any help is pre-appreciated