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On your computer graphics journey, you will eventually run into some paper or code mentioning spherical harmonic functions. They are indeed a very useful tool: with just a few coefficients, they allow us to approximate a given function defined on a sphere. This can be very useful for modeling complex lighting.
Doom 3 was released in 2004, which I can't believe was a decade ago. Great game, atmospheric and scary, and a worthy successor of the first two games in the series. Several years after the initial release, in 2011, Doom 3's source code was published on Github. It can be fun to poke around the repository to learn how…