gens 2 months ago I learned it from a paper "Spherical Harmonic Lighting: The Gritty Details" (link below), where the author uses a different form of the equation.I like the 3D in this one.http://silviojemma.com/public/papers/lighting/spherical-harm...

I learned it from a paper "Spherical Harmonic Lighting: The Gritty Details" (link below), where the author uses a different form of the equation.

I like the 3D in this one.

http://silviojemma.com/public/papers/lighting/spherical-harm...