I think I've stumbled onto a more serious problem.  Looks like megapov insists
on acting as if edges of step functions have zero diffuse.
Will continue in p.u.p.

"Greg M. Johnson" wrote:

> I have made an isosurface and there is a lot of banding on it, as you
> can see in the image below.  Any tips on eliminating it, asides from
> simply reducing the accuracy a few orders of magnitude?
>
> #declare celly=function{pigment{cells}}
> #declare fnoise=16;//40;
>
> isosurface{
>                 function{y/160-
>                 celly((x+1000)/fnoise,y/fnoise,(z+1000)/fnoise)
>                 }
>        accuracy 0.01
>         threshold  0.0  //  .03
>         contained_by {sphere{0,600}
>         pigment{SeaGreen}         normal{bumps}
>         finish{ambient 0.2}
>         }
>
>   ------------------------------------------------------------------------
>  [Image]

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