Alain <ele### [at] netscapenet> wrote:
> james lake nous illumina en ce 2008-05-14 19:41 -->
> > "Tim Attwood" <tim### [at] comcastnet> wrote:
> >> //----------------------------------------------------------------------
> >> // A thin blue media, becoming lighter as it approaches
> >> // the planet's surface.
> >> //----------------------------------------------------------------------
> >> #declare PlanetAtmosphere = sphere { <0,0,0>, 1
> >>    hollow
> >>    material {
> >>       texture {
> >>          pigment { rgbt <1,1,1,1> }
> >>       }
> >>       interior {
> >>          media {
> >>             emission <0,0,2>
> >>             density {
> >>                spherical
> >>                color_map {
> >>                   [0 rgb 0]
> >>                   [0.05 rgb 1]
> >>                   [1 rgb 1]
> >>                }
> >>             }
> >>          }
> >>          media {
> >>             emission <2,2,0>
> >>             density {
> >>                spherical
> >>                color_map {
> >>                   [0 rgb 0]
> >>                   [0.05 rgb 0.25]
> >>                   [1 rgb 1]
> >>                }
> >>             }
> >>          }
> >>       }
> >>    }
> >>    scale 1.05
> >> }
> >
> > I tried this and it works, but now the Earth is a solid white sphere.  Is there
> > another command that must accompany these?  Or should I change the settings?
> >
> > Thanks for the help!
> >
> > James Lake
> >
> >
> You put that object around your earth, scaled 5% larger than the size of the
> earth sphere.
>
> --
> Alain
> -------------------------------------------------
> You know you've been raytracing too long when you've ever "lost" a Julia fractal
> because you're not quite sure how to align things in four dimensions.
> Dylan Beattie

I did that but it still generates a solid white sphere.  It is not transparent,
and does not fade at the edges.  There must be another setting or command that
has to change.  The planet and the atmosphere get put together with this:

#declare Planet = union {
  object { PlanetSphere }
  #ifndef (Quick)
    object { PlanetCloudSphere0 }
    object { PlanetAtmosphere }
  #end
}

Is this a good way to do it?

Thanks,

James

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