Hints for CS543 Project 3

It is a good idea to have at least one configuration where the light is
directly above your surface.  This should give you maximum illumination.  The
reflectivity of the surface should be set relatively high (i.e., closer to 1
than 0), and your ambient reflectivity should be relatively low.  Make sure
the total of the calculation doesn't go out of the range [0 -> 1].  A grey
scale map is easier to verify than a colored one.