To map to a sphere:

#declare foo=function{...}
...
function {
   foo(atan2(x,z)/pi,atan2(y,sqrt(x^2+z^2))/(.5*pi),sqrt(x^2+y^2+z^2))
}
...

X goes around the equator from -1 to 1
Y goes from southern pole to northern pole from -1 to 1
Z goes outward from center from 0 to infinite

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