quote:
In order to avoid the person who is playing your game from seeing large amounts of the level disappearing you can use the fog to cover it.

I don't believe this is true. Fog is actually applied only to entities and map blocks, and not to the background image or the sky. If the map blocks disappear, so will your fog. The fog doesn't "hang in the air". It's not like volumetric fog.

I believe it can however cover up LOD changes.