A Mesh with Lighting

If we want to determine the shading of each face, we need normal vectors. The normal is an attribute of the vertex, just as is the color.

$i$	$p_x$	$p_y$	$p_z$	$r$	$g$	$b$	$n_x$	$n_y$	$n_z$
0	0.0	1.0	0.5	1.0	1.0	0.9	0.0	0.0	1.0
1	−0.5	0.5	0.5	1.0	1.0	0.9	0.0	0.0	1.0
2	−0.5	0.0	0.5	1.0	1.0	0.9	0.0	0.0	1.0
3	0.5	0.0	0.5	1.0	1.0	0.9	0.0	0.0	1.0
4	0.5	0.5	0.5	1.0	1.0	0.9	0.0	0.0	1.0
5	0.0	1.0	−0.5	1.0	1.0	0.9	0.0	0.0	1.0
6	−0.5	0.5	−0.5	1.0	1.0	0.9	?	?	?
7	−0.5	0.0	−0.5	1.0	1.0	0.9	?	?	?
8	0.5	0.0	−0.5	1.0	1.0	0.9	?	?	?
9	0.5	0.5	−0.5	1.0	1.0	0.9	?	?	?
10	0.0	1.0	0.5	0.8	0.0	0.0	?	?	?
11	−0.5	0.5	0.5	0.8	0.0	0.0	?	?	?
12	0.5	0.5	0.5	0.8	0.0	0.0	?	?	?
13	0.0	1.0	−0.5	0.8	0.0	0.0	?	?	?
14	−0.5	0.5	−0.5	0.8	0.0	0.0	?	?	?
15	0.5	0.5	−0.5	0.8	0.0	0.0	?	?	?