Thanks for the link to the tutorial, but I think that is another case. I
know those holes in Isosurfaces and yes sometimes they even disappear.
But I did not change anything in the Isosurface settings, but I translated
it only one tenth of a pov unit upward. In my case the same scene source
produces to different pictures - first, one isosurface misses, the second
time it doesn't. With this max_gradient-problem, the surface will always be
the same?

Marc-Hendrik


Gilles Tran schrieb in Nachricht <395C8D22.35D9BE2B@inapg.inra.fr>...
>Marc-Hendrik Bremer wrote:
>
>> I wonder, if others have experienced the same: Sometimes, when I just
change
>> my positioning in a scene a little bit (changed a "translate") and render
it
>> with megapov, one isosurface occasionally disappears.
>
>Possibly a max_gradient related problem.
>The usual solution is to look for the right max_gradient in the stats (it
>appears when using the "eval" keyword) and write it in the isosurface
>definition.
>Have a look at Mike Williams' tutorial here for a better explanation :
>http://www.econym.demon.co.uk/isotut/keywords.htm
>
>G.
>

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