@Karkadann
When you export your Age from Max and use Drizzle to convert it, a .fni file will be generated for your Age. This controls the fog in your whole Age. The method that wodan944 describes is perfect for setting the fog in certain areas in your Age (or having the fog change because of something the player did).
The settings in the .fni file that is generated is with no fog. You'll have to edit it with a program like PlasmaShop or UruFun. The settings that are there are all 0's (no fog at all). Fog settings are talked about in the GoW Wiki:
http://www.guildofwriters.com/wiki/FNI_SettingsIf you are having problems getting the color and "thickness" of your fog set right, try opening up the .fni file for one Cyan's Ages, who's fog looks like (or close to) what you want, to give you an idea of what numbers to use.
Sorry it took me so long to reply to your question. I've been busy with Eve Online.
______________________
Edit:
Here's a tutorial I just made for Max Users:
http://dusty.homeunix.net/wiki/How_To_S ... n_Your_AgeAgain, apologies for not seeing your question. My interest in Uru and especially MOUL:a is waning more and more each day. The spark I once had, has been gone for quite a while now, and I've just been doing things purely on inertia only. I've been spending more and more time working with High Resolution renders (aka Riven, Myst III, IV). My Blog explains it all:
http://dusty.homeunix.net/wiki/Andy%27s_Corner