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r_portalsopenall is a CVAR that toggles rendering between different landscapes.
r_portalsopenall 0 - Default, landscape will not be rendered until player walks into it.
r_portalsopenall 1 - Renders all landscapes.
This CVAR is useful while running takes place, because sometimes while running you tend to miss a trigger that renders the next landscape and it becomes hard to see where you're actually going.