Looks good...but it looks more like -x*x/(x*x - 1) to me. -x*x/x*x - 1 
is the same as -1 - 1, or just -2.
An isosurface wouldn't be hard, but the radial (or circular, depending 
on how you look at it) strings of spheres are interesting.
The spheres get kind of smudgy and fuzzy off in the distance...it looks 
like you used focal blur, is that what causes the smudges?

Just wondering, what does this function have to do with calculus?

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

Post a reply to this message