when i create fog i see this on my map
and when i make it smaller i get this

Main View



from the side



y is this and how do i get rid of it

also how do i make the fog thicker and thiner? i looked at Nmemic tut but i couldnt change the thickness :(

Bit of a wild guess here, but it looks as though your fog isn't extended far enough to fill the room. In the orthogonal view, does the fog brush fully cover the room?
I haven't played with fog much yet, but it seems to create odd artifiacts if you can see the side of a fog area. It has to be used so that players can only ever see the top of fog areas.

what i wanted was for the fog 2 fade in, if the fog HAS to cover the hole 4 walls how can u enter a room that is fogy without it messing up?
e.g a long corridor and as u get further down the corridor fog apears and it starts 2 get thicker as u proceed further down the corridor

I don't think you can, you couldn't with the Quake3 engine.
The only places I've noticed it used in the actual game are on the huge industrial elevator on a slope and in one of the DM maps. With the elevator you descend into it and in the DM map, you go down steps to enter it.

That said, I can't recall how you exit the fog in the elevator level, might be worth checking.

Also, the fog has a natural fade in effect when you use it.

I can't figure out how to get rid of it either. I just tried all sorts of things. It just doesn't seem to falloff properly or something.

If you make the fog entity the exact same size as the room you will get that weird glitchy effect. It looks almost like Z fighting and perhaps it is. To get rid of it make the fog extend past the wall boundrys just a tad. As for the fade in I have no idea, I have been trying to figure that out myself.

ok i have 2 rooms one above the other, the top level is foggy the bottom isnt, i have the fog in place n it looks ok, then when i go into the room below the fog is leaking thro the floor into the room below is there anyway 2 block the fog from leaking to the room below?, i have tried moving the fog higher so it doesnt go thro the floor but then the fog looks crappy in the top room lol, basicly i wanna know if theres a brush or some sort of clip or summin i dunno that blocks fog/light or what eva

why can't you just adjust the radius?

because then in the room above the fog doesnt coer the whle room, its a fairly big room n i cant seem 2 get it right, n if ifs its 2 small i get the werid box effect on the pics above, quit annoying

it will cover the whole room if the radius is the exact size of the room.

make a brush that is the exact size of the room. right click and turn that into a light.

try that.