Please help me understand rootset and garbage collection

[mdeni]

@metablaster

Can somebody please confirm that AddToRoot() and SetupAttachment() is the same as declaring variable with UPROPERTY and to prevent garbage collection? it’s a very basic question.

It’s not the same thing. You can read this to more info:
https://wiki.unrealengine.com/UPROPERTY

In a nutshell, Garbage Collection (GC) traverses the object hierarchy through designated UPROPERTY’s, starting from the root objects (hence AddToRoot and RemoveFromRoot methods). Any object that cannot be reached through this traversal will be garbage collected. Accordingly, non-UPROPERTY variables are not counted by the GC system.