private void interiorAreaInteriorArea_ ( int half_edge , int id_a , int id_b ) { if ( m_matrix [ MatrixPredicate . InteriorInterior ] == 2 ) return ; int faceParentage = m_topo_graph . getHalfEdgeFaceParentage ( half_edge ) ; if ( ( faceParentage & id_a ) != 0 && ( faceParentage & id_b ) != 0 ) m_matrix [ MatrixPredicate . InteriorInterior ] = 2 ; }
with the interior of area B .