Thanks for your help folks but, currently none of my tries has given any
result,

I removed the turbulence, used a tga with alpha channel, added hollow
keyword, tried all sort of transmit, filter settings... No way. The fog
still give a color to the transparent part of the mesh. ;-((

I will then have to define all the details in the source...



" It seems strange to me that a transparent object would change the
appearance
> of fog. The fog against the background should look the same as the fog
> against the background through the transparent object.
>
> However, if you're using *turbulence* in your fog, then that's the problem.
> The fog turbulence effect is caused by a simple calculation which doesn't
> actually simulate a continuous density function in 3D space. Against
> transparent objects, the turbulence calculations come up with different
> results than if the objects weren't there, causing the fog to appear
> turbulated a different amount over the transparent object than against the
> background next to it.
>
> If this is the problem you're facing, then you have two options as I see it:
>
>  - remove the turbulence in your fog
>  - replace the fog with media (and sacrifice render time)
>
>  - Slime
>  [ http://www.slimeland.com/ ]

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