You did not give very much information. What is the rest of the 
isosurface code? What threshold are you using?

My first guess: the problem has nothing to do with 0, it is that your 
first function goes up to the threshold value but not past it over a 
large volume, making the solver work harder to find the surface. Your 
second function goes past it by a tiny amount. I would not expect either 
of these functions to behave reliably with a threshold of 0.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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