A user called FreshLook is working on an enhanced version of the graphics engine for NWN2. Here's a fly-through demo of height fog in an interior area:
https://www.youtube.com/watch?v=548_IWYuAt8
I think that's the old Shadow Fortress tileset from the original campaign, but the fog adds an element of spookiness to the scene.
https://www.youtube.com/watch?v=548_IWYuAt8
I think that's the old Shadow Fortress tileset from the original campaign, but the fog adds an element of spookiness to the scene.