See  http://news.povray.org/3be10cf9@news.povray.org
>**** Dynamic maximum gradient estimation *****
>max_gradient G_max
>"eval(uate) P0, P1, P2"
>where
>  P0 is the minimum max_gradient value in the estimation process,
>  P1 should be more than 1 (over-estimation parameter), and
>  P2 should be less than 1 (attenuation parameter).
>
>The max_gradient, G_max, is re-calculated for each ray as following
>        If (G_max< G*P1)
>             then   G_max = G*P1*P1
>             else if (G_max>P0) then G_max = G_max*P2,

So, the max_gradient value in the scene file is the 'initial' value
and it is re-declared in the estimation (or rendering) process.



> Warning: The maximum gradient found was 184.775, but max_gradient of
> the isosurface was set to 1988.679. Adjust max_gradient to
> get a faster rendering of the isosurface.

I think only the sentense "Warning: The maximum gradient found was 184.775."
 is enough for the evaluatation result.

R. Suzuki

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