kike wrote:
> Does anyone know how fog works?
Yes

> Yesterday I was working in my Hiroshima image and I thought "It would be
> possible using ground fog, to make an spherical fog writing
> 
> up x*y*z

Not that way, obviously P))

> or something similar?"
> Well, the idea is that it happens something I dont understand but it doesnt
> sets any error. So probably something can be done.
> 
> And why I want to do something like this? because in some cases it can look
> like the interior propertie but renders much more faster. Does anyone know
> something about this?

Right off the top my my head, I can think of two faster alternatives to 
media:

MegaPOV's glow. It's fast.

A sphere like this (needs a background brighter than rgb<0,0,0>:

sphere{
  0,1
  pigment{rgbt}
  interior{fade_power 2 fade_distance .2 fade_color<10,10,3>
}

~Sam

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