Using the suggested solution by Gilles Tran, simply by adding method 1, the
scene renders perfectly in both cases. I understand what you say about
max_gradient and such, but my experience with isosurfaces (and unofficial
patches in general) is to never expect the expected.

>The problem is related to the fact that you have lied about the
>max_gradient value, and Megapov has trusted your value. If you replace
>the line "max_gradient 20" by "eval" (and render a very small image,
>otherwise it takes forever) then Megapov will calculate the true
>max_gradient and log it in the statistics output.
>

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