In article <Zml### [at] econymdemoncouk> , Mike Williams 
<mik### [at] nospamplease>  wrote:

> What? It's considered perfectly OK for the crackle pattern to completely
> disappear over 63% of the image because the root solver has a bit of a
> problem with one pixel?

No, the root solves does *not* have a problem (it is the same one as in
MegaPOV BTW).  The *function* is simply unsuitable for an isosurface in many
cases.  An isosurface technically requires certain properties of the
function, in particular that it is well-defined (following the constraints
required by isosurfaces) within the whole isosurface object's space.  If it
is not, what you have isn't really an isosurface also POV-Ray frequently
allows you to still render it (but that is just your luck).

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

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