Hi,
A lot of the appearance depends on how long it is from detonation.
http://www.cddc.vt.edu/host/atomic/nukeffct/enw77b1.htm
States:

2.05 The surface temperatures of the fireball, upon which the brightness (or 
luminance) depends, do not vary greatly with the total energy yield of the 
weapon. Consequently, the observed brightness of the fireball in an air 
burst is roughly the same, regardless of the amount of energy released in 
the explosion. Immediately after its formation the fireball begins to grow 
in size, engulfing the surrounding air. This growth is accompanied by a 
decrease in temperature because of the accompanying increase in mass. At the 
same time, the fireball rises, like a hot-air balloon. Within seven-tenths 
of a millisecond from the detonation, the fireball from a 1-megaton weapon 
is about 440 feet across, and this increases to a maximum value of about 
5,700 feet in 10 seconds. It is then rising at a rate of 250 to 350 feet per 
second. After a minute, the fireball has cooled to such an extent that it no 
longer emits visible radiation. It has then risen roughly 4.5 miles from the 
point of burst.



and continues to describe color effects etc ...

DLM



"Zeger Knaepen" <zeg### [at] studentkuleuvenacbe> wrote in message 
news:422d0f41@news.povray.org...
> slightly better shape, and a better background :)
> but it took 10 minutes to trace this time
>
> cu!
> -- 
> ZK AKA Gaeriel
> http://www.povplace.be.tf
> "Luckyly they included a button, right here, that'll blow the entire thing
> up!"
>
>
>

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