lighting selects the algorithm used to
calculate the effects of light objects on all surface and patch objects
in the current axes. In order for the lighting command
to have any effects, however, you must create a lighting object by
using the light function.
lighting flat produces
uniform lighting across each of the faces of the object. Select this
method to view faceted objects.
lighting gouraud calculates
the vertex normals and interpolates linearly across the faces. Select
this method to view curved surfaces.