Volumes are bad
The main reason for zone portals are for optmization. So that when you can't see a zone, the engine does not render it. Volumes don't do that. So to create a zone portal, create a plane that is the size of the opening, such as a door, and click on the special brushes button and select zone portal. Be sure to seal off the entire space. To add a indentifier to the "zone" go in the actor browser and to info>zoneinfo and place it in your zone. There should be many options for you to pick from in the properties.
The main reason for zone portals are for optmization. So that when you can't see a zone, the engine does not render it. Volumes don't do that. So to create a zone portal, create a plane that is the size of the opening, such as a door, and click on the special brushes button and select zone portal. Be sure to seal off the entire space. To add a indentifier to the "zone" go in the actor browser and to info>zoneinfo and place it in your zone. There should be many options for you to pick from in the properties.
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