Spherical harmonics tryout

Today, I finally took some time to experiment with spherical harmonics ! It is a logical progression as I was toying with irradiance cube maps.

For now, SH only permitted me to build those cube maps faster, and to get rid of the noise generated by GI sampling, but, hey ! It's a start !

I mainly referred to 'standard' SH resources ::
Hm, I really gotta keep moving towards more data driven rendering code to have, hm, let's say, SH compressed signal as a mesh attribute !...

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