Thanks, but I can't seem to figure out how to make that work.  All I
could get was this.  No, just kidding.  But in povray, the fuction for
arctan is kind of confusing.  I have two versions of plotters, one that uses
dx/dt and one that uses dy/dx.  I'll just have to wait for David's
explanation I guess.

-Ben Scheele

"Mack Tuesday" <mailbjl@yahoo> wrote in message
news:web.3df456428451b87c54f5973f0@news.povray.org...
> Ben T. Scheele wrote:
> >       That's a directional field for a differential equation, and it is
> >very cool.  What is the equation for it?
>
> I'm just guessing but y' = -arccot(|x| + |y|) would fit.
>

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