ok that fixed it .w.
although I thought you had to type it in as "mat_fullbright 0" and not "mat_fullbright set_value "0" "
thanks for the help guys c:
Ok, so I started playing Half-Life 2 again seein' as they just released achievements for it but then as I was playing, I reached Eli's Compound and the environment started doing this:
then when I got to Ravenholm, the lighting went back to normal
but when I got back to Highway 17 =3=...