https://gpfault.net/posts/sph.html
Article
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Tutorial introducing spherical harmonics (SH) tailored for graphics/rendering use
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Covers SH as basis functions for encoding lighting over a sphere
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Real-valued Cartesian form emphasized over complex spherical-coordinate form
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Practical focus: ambient occlusion, irradiance caching, light probes
Discussion
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Commenters praise Cartesian form intro — easier to grasp beauty vs. complex derivation
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SH also used in Ambisonics surround sound for arbitrary speaker decoding
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Key appeal for graphics: compress full-sphere lighting into just 9–16 values
Discuss on HN