>> This took a supprisingly long time to render... not entirely sure why. 
>>
> Isosurface with prety big gradients = slow.

Well, yes... POV-Ray wanted me to use max_gradient 2860 or something. 
But I actually used 120, which seems to work perfectly. (Clearly the 
steepest part of the function is nowhere near the surface...)

I imagine the poles create the high gradient...

(Note that this is actually the *logarithm* of the transfer function, if 
you want to be technical about it.)

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