I am still cursed by the following problem.  I've got a nasty blue line at
the
horizon that I absolutely cannot get rid of.   I've tried changing
the -y, -500
to -5000 and even -50000 and I've changed the scale orders of magnitude
either way to no avail.  Any other suggestions would be appreciated.  Do
I simply need to put vegetation out there to hide the horizon line?

Here is a repeat of the code:

>
> #declare mysky =
> material
>     { texture
>        { pigment
>           { granite
>             color_map
>              {
>                [ 0.0     rgbft <1.0, 1.0, 1.0, 0.0, 1.0> ]
>                [ 1.0     rgbft <1.0, 1.0, 1.0, 0.0, 0.0> ]
>              }
>             turbulence 1.0
>             omega 0.3
>             ramp_wave
>           }
>          finish
>            { ambient 1
>            }
>        }
>     }
> sky_sphere
> { pigment
>   { gradient y color_map
>       { [0 rgb 1]
>         [.3 rgb <0,.5,1>]
>         [1 rgb z]
>       }
>   }
> }
> plane
>   { -y, -500
>     material
>       { mysky
>         scale 5000
>       }
>   }
>
>

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