Get all actors of class vs Get all actors with tag

[pezzott1]

@Pawpatting

are they expensive because it takes a while to search for all actors in the world?

This.

@Pawpatting

Because I use things like Get All Actors Or Widgets With Interfaces/Tags, I just want to know how using those nodes to retrieve actors and their data to send messages, is any different from a cast

If the question is regarding Interface vs casting: They are not the same. Interfaces are usually use when communication is needed across many differente classes. Casting is to know the reference you have is of a specific type or inherited from to do stuff with.

In both cases a reference is still needed to either check if it implements an interface (a type of casting if you will) and to check if its of a specific type (cast).

@Pawpatting

If you’re using this over and over again, sending messages, it would seem as though these actors would have to be permanently loaded into memory. It cannot be garbage collected as long as you’re still using it, and it still exists within the Level.

Using any of the Get nodes no matter how often won’t prevent anything from getting destroyed. It just doesn’t work like that.

@Pawpatting

So why is it that one is not considered a hard reference when the other is?

This post explains hard references better than I ever could: Blueprints can develop a hard reference dependancy chain, but C++ derived classes do not? - #10 by Ari_Epic

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