I’ve added the volumetric fog in the Camera dialog. You can control the
color of the fog, its height, transparency, the wind/smoke animation
speed, the texture scale

When you get closer to the fog, the overall fog parameters are changing
to emulate a real fog density.

At the time you enter into the fog, you have some trouble to see
anything.

When you are under the fog you stillhave a lot of fog, the sky is
darker, but you can see the closest objects.

Now we go out from the fog!