As you might know, fog is not working or at least not working properly in Aspyr's 2016 Steam patch for KotOR 2: TSL. An official fix for this issue doesn't seem to be in sight but luckily HappyFunTimes101 wrote a fix himself.
To show the issue with the 2016 patch, here's a comparison between the Steam and the GOG version:
As you can see, the fog is really screwed up in the latest Steam version while all other versions (4CD, DVD, gog, Steam legacy) look the same as the "gog pictur