Wasn't it Nathan Kopp who wrote:
>
>For the record, there was no bug with POV-Ray in this case.  (See my post to
>Sigmund's other post.)  In this case, the user-defined function was trying
>to take the square root of a negative number, which is not defined as a real
>number.  I don't know why it worked with MegaPOV, because it shouldn't have.

I seem to remember that there has been considerable discussion
previously on one of the povray newsgroups about the fact that MegaPOV
isosurfaces incorrectly treat the square roots of negative numbers as if
they were positive numbers.

-- 
Mike Williams
Gentleman of Leisure

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