I want use fog effect by my sof2 custom map. please teach me about how to use fog effect.
I'm not sure about using the fog effect but I know where it is and how to add fog. Just goto Textures-->Tools and then scroll down through the bottom righthand screen until you find the one that says fog. Now grab a brush and make a box where you want the fog, and click on the the fog icon in the bottom right. Save and close, reload and your fog should be there.