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Saving specific sublevel actors transform?

I’m trying to make a open world map, that uses sublevels to help performance.
Saves the transforms of actors before unloading the sublevel.

Currently I’m checking all actors and get its sublevel name to check. But it seems heavy.

Q. How can I check/save specific sublevel actors?

Something you could do, is let the actors save themselves, if and when they change transform.

That relies on everything being a blueprint, of course.

Failing that, there’s always something like

This doesn’t seems to show its source to how to do it.

You mean how it works? There’s a documentation link.