docs: private void exteriorAreaInteriorLine_(int half_edge, int id_a) {
  		if (m_matrix[MatrixPredicate.ExteriorInterior] == 1)
  			return;
  
  		int faceParentage = m_topo_graph.getHalfEdgeFaceParentage(half_edge);
  		int twinFaceParentage = m_topo_graph
  				.getHalfEdgeFaceParentage(m_topo_graph
  						.getHalfEdgeTwin(half_edge));
  
  		if ((faceParentage & id_a) == 0 && (twinFaceParentage & id_a) == 0)
  			m_matrix[MatrixPredicate.ExteriorInterior] = 1;
  	}