Well, I found some vispatch files here:
Nothing for Abyss of Pandemonium though.
I don't thinkg Abyss of Pandemonium needs vispatching.. did you try it?
That's only for world rendering though, isn't it? If you're inside water, you won't see mobs or movable entities outside the water.
Can't recall if vispatching worked like that, though - it's been a while :)
Oh, yes. I also recall something like that. Well, monsters cannot see you in the water. It is just fair ;)
Well I've set r_novis = 1 and the wateralpha to 0.7, and I can see both architecture and items and monsters within the water when I'm not in the water, so that all works fine. Haven't tested looking at stuff outside the water when I'm submerged in it though.
It is possible that my old Quake 1 and expansion pack files (from before my GOG purchase) are already vispatched, but Abyss of Pandemonium I've no idea. It is a re-released expansion so they may have vispatched it themselves. In any case, I can see into the water in that expansion, too. Just need to test looking out from within the water now.
EDIT: Oh, and I've been testing it in DarkPlaces, so I probably ought to test it in QuakeSpasm too.