> Warp<war### [at] tagpovrayorg>  wrote:
>> D103<nomail@nomail>  wrote:
>>> The disc had a pigment map, which started of as white, changed to yellow about
>>> half way, and then faded to transparency. It also had an ambient of 1, and was
>>> at the same position as the light source. When rendered the disc showed up as
>>> pure white, even when I reversed the pigment map.
>>
>>    What pigment map, exactly? (Better yet: Show us the entire object
>> definition.)
>>
>> --
>>                                                            - Warp
>
> Here are the relevant objects :
>
> #declare LiPo =<-2000, 250, 0>;

> sphere { LiPo, 100 hollow pigment { Clear } interior { media { scattering { 1, 1
> } density { spherical density_map { [ 0 rgb 1 ] [ 0.25 rgbt<1, 1, 0.5, 0.5>  ] [
> 1 rgbt 1 ] } } } } }
>
That media is white at the origin (absolute location <0,0,0>), shifting 
to light yellow at 0.25 unit radius, then back to white at 1 unit and 
stay white everywhere. The sphere is not centered at the origin, the 
non-white part of the pattern is totaly outside the sphere.
> I have enabled radiosity with media on for this scene.
>
>
> D103
>
>

Radiosity have no effect on the media. "media on" in the radiosity block 
enable the media to affect it's surrounding.

Why do you use rgbt in your density map? rgbt 1 acts like rgb 1.

I'd use simply this:

sphere { 0, 1 // unit sphere at the origin
hollow pigment { Clear }
interior { media { scattering { 1, 1}
  density {
  spherical density_map { [ 0 rgb 1 ] [ 0.75 rgb <1, 1, 0.5> ] [1 rgb 1 
] } } } }
  // NO transmit as it don't work for media
scale 100 // Scale up to desired dimention
translate LiPo // Finaly, place it where you want it.
}



Alain

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