Never mind....
    ...contain it in a torus of the same size and then use color_map to take
away rings....



Bill DeWitt <the### [at] earthlinknet> wrote in message
news:37d5af71@news.povray.org...
>
> Peter Popov <pet### [at] usanet> wrote in message
> news:YEHTN98AgfONAna9Zlxr9xZUrTnB@4ax.com...
> > Here's a formula that John VanSickle gave me when I was looking for a
> > way to make toroidal media:
> >
> > sqrt( y*y + (sqrt(x*x+z*z)-1)*(sqrt(x*x+z*z)-1) )
> >
> > This makes a torus of major and minor radii 1. Some tweaking of the
> > frequency and phase keywords might be necessary. Enjoy.
> >
>
>     I am having the same problem with this that I have had with other
> formulas. It appears to make an intersection of two spheres with a sphere
> punched out of the middle.
>
>     This make a good torus in an Isosurface statement, but chops off the
> inner curve in media. I tried laying it over a spherical and cylindrical
> density and playing with the density in a color_map but all that gave me
was
> a faded convex edge (see p.b.i.)
>
>     Did you have any better results with media?
>
>
>
>

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