kike nous apporta ses lumieres en ce 11-04-2007 09:33:
> Does anyone know how fog works?

> 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

> 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?


Ground fog is relative to a plane and the "up" vector is the normal of that 
plane. Anything below the fog_offset have a constent density, and that density 
diminishes according to that formula: 1/(1 + (y - Fog_Offset) / Fog_Alt) ^2 .
Fog is not contained and don't interact with light (the main reason why it's 
faster).
Translation don't affect fog. You can rotate the fog or the up vector.

-- 
Alain
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Everything can be filed under "miscellaneous".

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