Hello, I'd like to ask if there is any way to divide fog planes into sections, within the map, so that it doesn't run into underground structures. As some may have noticed, the discussions about halo custom edition fog creation is limited. I have tried dividing it with portals, to no avail. Then I tried detaching the underground part of the map, and place it far away from the main map, within the sky, and use teleporters to get to it. Yet I get rendering errors in sapien, and halo, when inside the underground part. When you look toward the direction of the main map, the walls disappear. So, anyone know how to divide fog planes? Any help is much appreciated.

You do need portals.
Then you need to manually change the fog in the bsp tag in guerilla (an unlocked version).

In guerilla find, the cluster section and you will see options for sky, fog, sound and weather.
Figure out what cluster you don't want there to be fog in, set the number in the "fog" box to -1. Leave the number alone where you DO want fog.
An easy way to figure out what cluster this is if you have lots of portals is to set a sound_environment in sapien where you want to make changes. Save. Then find your sound_environment in the tag and that is the cluster you want.

Only do this when you are done with your bsp model, otherwise you will have to redo this each time you make changes.
Also, you won't see any fog when looking from an no fog cluster to a cluster with fog.

alright, I will try that in a bit, and see if it works or not. Thanks so much for answering back with such a good answer. Question, does it matter whether its an exact portal or regular portal?

It does not matter.

There is no way to do it, if you look at b30 from campaign, you'll notice it switches BSPs when you head underground to the point you would intecept the fog plane. If you are working on a sp map, use another bsp, if it's mp, you're kind of screwed.

Yes you can.
It is done in a30. You can open the first bsp (a30_a) and look at the clusters and see the fog change from the outside fog to the inside fog. I have also done this where there is fog in one cluster and not in another using the method above.

I believe the rules for that differ from water fog planes. I believe you are talking about the entrance to the cave?

You can do it with water fog planes as well, it works exactly the same. The water is only collideable in the cluster where you specified there was fog.

For both, if you are in a fog cluster and look outside to where there would not be fog, you will see fog. The opposite for being in a no fog cluster.

Just confirming what ZX said as I have also tested this in the past, he is 100% correct.

Alright guys, i have as yet not tested this method, because im currently working on details for the map. But in the next couple of days I will be adding the clusters and finalizing the map in Sapien by adding the fog. If it works or not, I will soon get back to you guys. Thanks again for the help, its much appreciated.

Is there an established way to set up the portals properly so it does not affect visuals but also effectively isolates the water cluster(s) so the fog is not map-wide? I don't have portals exactly defining the lake; I'm having too many problems as it is with setting up the portals. Documentation is scarce.

Alright, Thanks for all the help, everything is working great now :) this was a huge time saver. If anyone needs any questions on this (which i know i had millions, but eventually figured them out) my xfire is captainkyle. Glad halomaps forums still has such great support, keep up the great work guys!

cfstargazer, please speak to me on xfire Crypt (blackcrypt) - already friends with you. Need your help!