With the new World Composition tool, is it possible to procedurally spawn objects into separate streaming levels or is it all still pretty much done manually?
Alternatively, could I spawn 1 map into the persistent level, then open one of the streaming sub-levels and spawn another map, and then open another streaming sub-level to spawn a third map, and then return to the persistent level? Then if the sub-levels get streamed in, they would retain the maps that I have spawned into them?
There is no difference with traditional level streaming. From blueprints you can spawn actors only in the persistent level. But in C++ SpawnActor function supports overriding target level. So you could write your own wrappers to do a procedural spawning in a streaming levels.
Don’t believe so. Haven’t seen any notes for 4.5 that allow you to do it through blueprint either.
There might be a workaround where you load level and spawn actors, then load a new level and more spawning, and repeat until finished. Might work. I probably won’t have time to work on it for some months at least, but if you make any progress it would be great to hear.