Christopher James Huff wrote:
> 
> 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.

Note that 'accuracy' plays an important role in that concern, if it's set
smaller than 0.0001 in this case things should work.

But it's of course right that it is not a good idea to use such functions
in an isosurface.

Christoph

-- 
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