two blue spheres, a white wall, a blue light, and a yellow light
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mixing a light with its complementary material color results in a complete cancellation: 1 1 0 yellow * 0 0 1 blue ------------- 0 0 0 black multiple lights mix first with the surface color, then are summed.
1 1 0 yellow 0 0 1 blue
x 1 1 1 white x 1 1 1 white
-------------- --------------
1 1 0 yellow 0 0 1 blue
1 1 0 yellow
+ 0 0 1 blue
-------------
1 1 1 white
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