Strips nodes not in inod and remaps connectivities.
        Omits elements where remap[conn] contains -1...

def localize(self, inod):
        """
        Strips nodes not in inod and remaps connectivities.
        Omits elements where remap[conn] contains -1...
        """
        remap = nm.empty((self.n_nod,), dtype=nm.int32)
        remap.fill(-1)
        remap[inod] = nm.arange(inod.shape[0], dtype=nm.int32)

        self.coors = self.coors[inod]
        self.ngroups = self.ngroups[inod]
        conns = []
        mat_ids = []
        for ig, conn in enumerate(self.conns):
            if conn.shape[0] == 0:
                continue

            aux = remap[conn]
            ii = nm.unique(nm.where(aux == -1)[0])
            ii = nm.setdiff1d(nm.arange(conn.shape[0], dtype=nm.int32), ii)
            conns.append(aux[ii])
            mat_ids.append(self.mat_ids[ig][ii])
        self.conns = conns
        self.mat_ids = mat_ids

        self._set_shape_info()