@pimms.param<EOL><INDENT>def faces(tris):<DEDENT>
tris = np.asarray(tris, dtype=np.int)<EOL>if tris.shape[<NUM_LIT:0>] != <NUM_LIT:3>:<EOL><INDENT>tris = tris.T<EOL>if tris.shape[<NUM_LIT:0>] != <NUM_LIT:3>:<EOL><INDENT>raise ValueError('<STR_LIT>')<EOL><DEDENT><DEDENT>return pimms.imm_array(tris)<EOL>
tess.faces is a read-only numpy integer matrix of the triangle indices that make-up; the
  given tesselation object; the matrix is (3 x m) where m is the number of triangles, and
  the cells are valid indices into the rows of the coordinates matrix.