happymat I tried but it didn't work.

I am trying to light this dungeon as a night scene where it's dark but I can see detail. I was able to do that but I also wanted a light fog going through the window and a shadow of the bars to show on the ground. When I put the light fog through the window and make sure shadows are checked it just gives me a light fog but no shadows of the bars on the ground.Also isn't there a way to change the light fog to a box shape, so I can fit it perfectly through the window.