A few ways of doing it...
Play with the Gamma to fade the whole screen (full screen only)
Stick black a quad (or sprite) infront of the camera and entityalpha it from 0 to 1 to fade to black.
Fade out all the DX lights (including ambient light) to 0,0,0 (obviously this won't work with full bright stuff)
That's probably about it.
Play with the Gamma to fade the whole screen (full screen only)
Stick black a quad (or sprite) infront of the camera and entityalpha it from 0 to 1 to fade to black.
Fade out all the DX lights (including ambient light) to 0,0,0 (obviously this won't work with full bright stuff)
That's probably about it.