I've played Doom II and I've noticed that the water
texture hasn't glowed in some levels either. It didn't
glow in Map01 at all, Map02 didn't have this problem
(btw, on the walls effected by the glowing flats, I've
noticed the same dark streaks on the walls where the
vertex meet. again I didn't get this problem in direct
x mode) And in Map03 I could hardly see the glow but
wasn't glowing as bright as map02 did.