Thanks Jan,

  I now have a shy sphere that looks good:

sky_sphere {
  pigment {
    gradient y
    color_map {
      [(1-cos(radians( 90.0)))/2 color 1.2*<238,2,255>/256]
      [(1-cos(radians( 90.3)))/2 color 1.1*<3,5,112>/256]
      [(1-cos(radians( 91.5)))/2 color Black]
    }
    scale 2
    translate -1
  }
}

If I then use a constant fog I get a good looking shy if I multiply the
above colors by the reciprocal of the minimum translucency I use in the
fog.  However the fog looks better when I use a ground fog but that reallys
messes up the look of the sky sphere and I'm not finding an easy way to
correct for it.  Is there a way to turn the fog effect off just for the shy
sphere?  Any other suggestions?

The fog I'm currently testing is this one:

fog {
  distance 450
  color rgbt<0.0, 0.0, 0.0, 0.1>
  fog_type 2
  fog_offset 0
  fog_alt 10
}

And if it helps here is my current camera:

camera {location <10,31,1> look_at <524,0,440-524> angle 30 right
camera_right}

Carl

"JWV" <jwv|at|planet.nl> wrote:
> Hi Carl,
>
> Nice project you have here.
>
> some tips to create the effects you want:
> (1) use fog. Should be in the help file somewhere. It's pretty fast, so
> don't worry.
> (2) the skysphere is the way to go.
> (3) cones with emmitting media like you said. Maybe you need to play around
> with cylindrical density to get the disired effect. This may slow down the
> rendering. For test renders i suggest using cylinders with finish{ambient 1}
>
> Greetings,
> Jan

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