Here are the new tests
The old ones are here.

A test with 5 spheres:
Positions:
1: .3, -.4, 1.2
2: -.4, .4, 2.4
3: -.2, .2, 1.3
4: -.4, -.4, 2.4
5: -.0, -.1, 1.2
Light Position: -1, -1, -2.6



A test with three spheres aligned:
Positions:
1: .0, .0, 1.2
2: .0, .0, 2.0
3: .0, .0, 3.0
Light Position: 2, 0, 1


A test with 2 spheres & back lighting:
Positions:
1: .0, .0, 1.2
2: .6, .6, 2.0
Light Position: 0, 0, 2.0


A test with no spheres:
Light Position: 2, 0, 1


A view from the inside of a sphere:
Position:
1: 0, 0, 0
Light Position: 2, 0, 1


A test with 5 spheres & no ambient or diffuse light:
Positions:
1: .3, -.4, 1.2
2: -.4, .4, 2.4
3: -.2, .2, 1.3
4: -.4, -.4, 2.4
5: -.0, -.1, 1.2
Light Position: -1, -1, -2.6


A test with 5 spheres and full ambient and diffuse light:
Positions:
1: .3, -.4, 1.2
2: -.4, .4, 2.4
3: -.2, .2, 1.3
4: -.4, -.4, 2.4
5: -.0, -.1, 1.2
Light Position: -1, -1, -2.6