> This sounds like typical artifacts of the isosurface intersection 
> solving algorithm. If so, it has nothing directly to do with the log() 
> function, it is caused by your function having too high of a gradient.
> Using higher quality settings (mainly a higher max_gradient) will reduce 
> or eliminate these artifacts.

The log function is here used in a range containing zero. The derivative
of log at zero is infinite, so the gradient is unbounded and no max_gradient
can suffice.


-- 
merge{#local i=-11;#while(i<11)#local
i=i+.1;sphere{<i*(i*i*(.05-i*i*(4e-7*i*i+3e-4))-3)10*sin(i)30>.5}#end
pigment{rgbt 1}interior{media{emission x}}hollow}//  Mark Weyer

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