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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