Introduction Spherical Harmonics (SH) are a type of Spherical Radial Basis Function (SRBF) that can be used to encode signals defined on a sphere in a compact way. This makes them an excellent fit for encoding a variety of datasets commonly used in real time graphics. One such dataset is irradiance maps. Spherical Harmonics are distributed across an infinite series of 0-indexed bands, with each band n adding 2*n+1 coefficients to the set. Higher bands add more granularity by encoding progress...
