james lake napsal(a):
> 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
> 
> 
Try greatly reducing the media density. The density required is very 
dependent on your earth size.
Simply add another density block inside the media, like:
density{
  ...
}
density{
  rgb 1e-5
}

-- 
You know you've been raytracing too long when...
you ever saw a beautiful scenery and regretted not to take your 6" 
reflective ball and a digital camera, thinking "this would have been a 
perfect light probe"
		-Johnny D
Johnny D

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