In article <3F9### [at] informatikuni-freiburgde>,
 Mark Weyer <wey### [at] informatikuni-freiburgde> wrote:

> The log function is here used in a range containing zero. The derivative
> of log at zero is infinite, so the gradient is unbounded and no max_gradient
> can suffice.

Right, but it reaches infinity at a line along the y axis, and the 
surface quickly moves outside the container object. A high enough 
max_gradient should get rid of most of the artifacts that show up. For 
this isosurface, max_gradient 12 almost completely eliminated the 
problems.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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