Fog in only the lower part of a sector

[Ixnatifual]

For example, a pit where there's no fog at the top portion, but if you look into it, the bottom is obscured by fog. Should look pretty neat, methinks. I tried messing around a bit with SetFade and 3d floors, but no luck. Is this possible to do?

Something like this picture:

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[Tiger]

I could see this possible with having an abundance of translucent 3D Objects, but the way I am seeing it - it isn't a quick job.

[NeoHippo]

Solarsnowfall came up with that idea in Nov 2005 and made a test map, insanotest.wad

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and also applied this idea to the blue column.

[Tiger]

That is really beautiful!