Model 4 is probably best in this case, since it was meant to model the
scattering of gases.
And when using light fading, bear in mind that the scattering media itself also
attenuates light.

Margus

Chris Huff wrote:
> 
> To get a halo around a light source, try changing the scattering model.
> Isotropic scattering means that all the media which isn't in shadow will
> be illuminated by the light, try something more angle dependant, like
> Mie murky, which is type 3.
> Also, use the fading feature of the light sources to get a better model
> of illumination, although it also takes some time to get used to.
> A good way to fake this glow around light sources is to put the
> light_source at the center of a completely transparent sphere, and give
> that sphere a highlight(I have always used specular, you might want to
> try phong). Adjust the size and brightness of the highlight to do what
> you want.

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