In article <3994C91B.83A136DB@yahoo.com>, lem### [at] yahoocom wrote:

> Hi,
> 	I've not played with the media since the halo statement doesn't exist
> anymore... I'll make it simple, how can I make a halo sphere...  on a 
> black background a white spherish cloud should apear as the light 
> flows through (ie: constant density, reflect color of light as rgb 1)

I assume you want the halo effect seen around light sources in fog...
You need to use one of the scattering functions other than isotropic. 
Mie hazy and Mie murky(types 2 and 3) should work well. Rayleigh(4) 
might work under some circumstances, Heyney-Greenstein(5) could give you 
more control over the size of the "halo".

You could also "cheat" by using emitting media with a spherical density 
function...but you said you wanted constant density, so I guess this 
isn't what you want.

If you want good results with a reasonable render time, use MegaPOV, 
which has additional sampling methods which can give smoother results 
with less rendering time.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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