Christoph Hormann schrieb in Nachricht <3BBE0827.BE2E41F3@gmx.de>...
>Accuracy just influences how small details are visible, lower values lead
>to more detailed surfaces and usually require higher max_gradient.  Just
>try it, the default value of 0.001 is quite low, if you use for example
>0.1 on a RMF function isosurface, you will get a not very detailed
>surface.
>


While you are right that higher accuracy values decrease the level of
detail, it has other influences, too.
I just tried it with an old scene and attached the resulting image. I
increased the accuracy value by far (0.1 instead of 0.000001) and left
anything else the way it was (after converting to 3.5 language of course).
Pov reports, that I should decrease max_gradient to lower rentertime  (5.141
instead of 6). In my opinion that black part is one of those isosurface
artefacts.

Marc-Hendrik

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