How to use Streaming Levels (not tiles) inside WorldComposition?

Development World Creation
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1

Any ideas?

For example i want to create Caves / Indoor rooms inside my WorldComposition.
And that Caves/Rooms must use the same instance of GameMode, which uses WorldComposition (i.e. i can not use normal levels or another worldcomposition, i need exactly streaming levels, which uses GameMode of PersistentLevel, i.e. of WorldComposition->PersistentLevel)

So i want to load/unload Caves/Rooms by triggers.

2

Ok, i think i found the way.

I will need only 1 world composition, then i will create Tile sublevels, place them inside Layer for Tiles. And if i need caves, i will create appropriate sublevels inside the same world composition, but i will place them inside their own Layer and own streaming Distance, smaller than distance for Tiles, if the cave is small. After that i will arrange my Caves under existing Tiles. (the only problem in such situation, that World Composition editor is really bad for arranging).