3d xyz coordinates to Harmonics coordinates back and forward?

[abahena]

Harmonics maps

Hi,​

​

Im wondering whats the best way to create rom 3d coordinates to Harmonics maps back and forward.
Thanks,
-Alexis​

 

[HallsofIvy]

1) Why in the world in that light color?

2) What definition of "harmonic coordinates" are you using?

 

[abahena]

Sorry about the color.
I found what I was looking at Stupid Spherical Harmonics (SH) Tricks - Peter-Pike Sloan's
very usefull text.