Both spheres and sky_spheres interact correctly with radiosity, so it doesn't
matter which you use. But to layer clouds over a sky (which is what I think you
want to do) you can just use a layered pigment, something like this:

sky_sphere {
  pigment {
    //first layer
    gradient y
    color_map {
      [0.0 color rgb < 0.880, 0.935, 0.976 >]
      [0.2 color rgb < 0.300, 0.450, 0.950 >]
    }
  }
  pigment {
    //second layer, any transparent bits of this will let you see the first
layer
    bozo
    turbulence .5
    scale <.3,.1,.3>
    rotate x*180
    colour_map {
      [0.3 rgb 0.8]
      [0.5 rgb 1 transmit 1]
    }
  }
}

-- 
Tek
http://www.evilsuperbrain.com

"David Wallace" <dar### [at] earthlinknet> wrote in message
news:3f2916ef$1@news.povray.org...
> How do I set up a textured sky in such a way that radiosity will work with
> it?  I can get a radiosity sphere right from the scene samples:
>
> sphere {
>   <0, 0, 0>, 1
>   texture {
>    pigment {
>      gradient y
>      color_map {
>        [0.0 color rgb < 0.880, 0.935, 0.976 >]
>        [0.2 color rgb < 0.300, 0.450, 0.950 >]
>      }
>    }
>    finish { diffuse 0 ambient 1 }
>   }
>   hollow on
>   no_shadow
>   scale 30000
> }
>
> I also learned how to set up a textured sky_sphere:
>
> #declare Sky1 = pigment { image_map { png "skyday9.png" interpolate 2 }
> scale <.15,.5,.15> }
>
> #declare Sky = sky_sphere {
>  pigment {
>    Sky1
>    warp{
>     spherical
>     orientation z
>     dist_exp 1
>    }
>   rotate x*180
>  }
> }
>
> Now how do I put these two great tastes together to make some awesome eye
> candy?
>
>

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