I want to add mist/fog in the compositor for my scene but i dont understand how to add it.
I have looked up and nothing seems to tell me exactly how to do it because in my version of blender (2.79) because there is no mist output connection in the renderlayer node (image attached). I tried using volumetrics bt it also just made everything go dark- maybe because my scene is very large but i dont know.
Also preferably i would like to know the compositor way because my computer is too slow to keep up with volumetrics.
Thanks in advance