Gail Shaw wrote:

> I had a similar thing a while ago, I was using a pigment function and adding
> it to x^8+y^8+z^8. Often the entire isosurface (or large parts) of it
> disappeared. I never actually solved the problem, but I got the isosurface to
> appear
> more-or-less
> intact by moving it around and scaling the pigment by small amounts.

This drove me crazy too, until I discovered that having a proper max_gradient
value fixed the problem. Now I have a first run without max_gradient, I look at
the statistics and use the max_gradient value shown there.

G.

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