Here are some trials on using media to mimic standard fog (which is in 
itself really a pseudo volumetric fog ... does this mean I'm going 
backwards??? ;) )
Anyway, with the limitations of standard fog, I wanted something which I 
could assign to a container, control the density, etc, etc. The way I've 
got it is a sphere container scaled to fog_dist and centered on the 
camera. Two media statements do the ambient fog thing. f_samp_param() is 
a macro which provides the sampling parameters (method 2). Currently the 
value for f_density is 10 and fog_dist is 10*distance where distance is 
equivalent to the standard fog keyword.

media{
    emission (f_color*f_density)/fog_dist
    f_samp_param()
}

media{
    absorption f_density/fog_dist
    f_samp_param()
}

The third image shows some preliminary trials with scattering media (a 
light source illuminated fog).

Abe
________________________________________
Stop by at www2.taconic.net/bullfrog/sky

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