> One more thing: what is the proper way of scaling the pigments or
functions?
> Their frequency is so high that the pattern occurs more than once on a
> single sphere.

f_ph probably returns an angle from -pi/2 to pi/2. You can use f_ph(x,y,z) /
pi + .5 to get that between 0 and 1.
f_th probably returns an angle from 0 to 2*pi. You can use
f_th(x,y,z)/(2*pi) to get that between 0 and 1.
f_th might actually return an angle from -pi to pi, in which case
f_th(x,y,z)/(2*pi) + 1 will work.

 - Slime
 [ http://www.slimeland.com/ ]

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