"Mike Williams" <mik### [at] nospamplease> wrote.
>>> Isosurface *disappears* at high resolution (fwd)
>>> http://news.povray.org/3bb0b351@news.povray.org
>>
>>Cannot duplicate.
>
>I can duplicate this (although the quick version that I wrote now runs
>to completion). The point at which the quick version collapsed into
>blankness has varied from beta to beta, and now manages to go all the
>way through. The original scene file posted by Warp still fails when
>rendered with the specified size and antialliassing.
>
>The question is whether this is a bug, or whether isosurfaces that use
>crackle can legitimately be expected to disappear.

This is not a bug.  That behavior is due to the wrong max_gradient value.

The function of the original scene file posted by Warp has extremely 
large gradient values.  See the warning message.

Try the following function for the isosurface of that scene,

function{min(1,max(-0.5,(1+Blob_threshold)-Blob_threshold^Funki1(x,y,z)
          -Blob_threshold^Funki2(x,y,z)))}

The maximum gradient in the warning message is much lower than that of 
the original function.  Then, it gives us better result.

R. Suzuki

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