david sharp <dsh### [at] interportnet> wrote in message
news:387a0473@news.povray.org...
>
> Ron Parker <ron### [at] povrayorg> wrote in message
> news:387a0293@news.povray.org...
> > On Mon, 10 Jan 2000 10:55:52 -0500, david sharp wrote:
> > >The isosurface stuff converts x to absolute value of x
> > >before trying to use the ^. This is just to avoid many floating
> > >point errors.  The isosurface code does the same conversion
> > >before applying sqrt() or ln().
> >
> > Does it only do that for fractional exponents, or does it also
> > do it for odd integer exponents?
>
> Always.

No, not always. (I should have actually checked before replying)
there is a ffloor test to distinguish integers from fractions.

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