# pass group0 and ids of faces of group1 to inverse
nbRev = mesh3D.Reorient2DBy3D([ group0, group1.GetIDs() ], mesh3D, theOutsideNormal=False)
# pass group0 and ids of faces of group1 to inverse
nbRev = mesh3D.Reorient2DBy3D([ group0, group1.GetIDs() ], mesh3D, theOutsideNormal=False)