MultiWorld - Run different worlds in parallel with the option to transfer players and actors

Hi everyone! The update for UE4.26 has been submitted to Epic for review. We’ll update you here when the new version will be available in the Marketplace.

Hi! The update for UE4.26 is now available in the Marketplace.

Hi! We updated the Demo project to UE4.26: GitHub - UNAmedia/ue4-multiworld-demo: "MultiWorld" UE4 plugin demo

Hi everyone! The Unreal Engine Marketplace February Sale started, and you can find MultiWorld in sale now through February 19! If you were waiting to give it a look, well, this is the right moment to save 50%: MultiWorld in Code Plugins - UE Marketplace

Hey, I’m still hesitating to buy this plugin because of the non-replicated secondary worlds.
I’d totally have a use-case if secondary worlds would be fully replicated with physics and so on.

Is there any progress in this regard?

At the moment we don’t have useful updates on the subject. We’re experimenting on it, but at the moment we are more focused on bug-fixing and removing other simpler restrictions (that in turn are enabling new features that will be available soon).

Ok, thanks for the quick reply. Appreciate it. :slight_smile:

I’ve been having a lot of issue / crashes from calling “Load Level” from the main world when secondary world still exist. My issues happened mainly because the secondary world is truly being ended by the plugin OnWorldPreActorTick. What’s the correct way to Load a new level with the plugin? Is there a reason why the plugin doesn’t end the secondary world immediately when “End World” gets called?

I am using Unreal 4.26


Of course there are technical reasons for deferring the deletion of a World, otherwise we would have deleted it directly :slight_smile: Basically when you call the EndWorld() method, you could be inside a Tick() callback of the same world, and the UE4 engine doesn’t support deleting the world in this scenario.

It’s not clear if this is your case, but if you’re trying to have multiple instances loaded at the same time of the same Secondary World, then you must follow the instructions documented here.

If instead your use-case is something like: LoadWorld(X), DeleteWorld(X), LoadWorld(X), then it could be a bug or a use-case that must be further investigated. In this case please provide the following:

  • the complete UE4 log file of the crash (including the stack trace <- important);
  • the snippet of code causing the crash (if it happens in a particular method/blueprint of your game).

If you prefer, you can send the information at .

Test post to check EDIT permissions in the new forums (sorry for the bump!)

I have purchased the plugin and have been trying a few things, sorry for long period
As I understand it -
When a secondary world is loaded the main world is unloaded ? at least not visible on the screen.
If I make the secondary level a sub level of the main persistent world the main world is not visible (so I presume it is unloaded)

I will try to explain my requirement

I have certain infrastructure that needs to go in the main world and is replicated. When I switch to "A N other world - can the main world still be visible ? (and interacted with)

Thanks Paul G

Hi Paul!

We tried to introduce the main concepts of the plugin, and how they interact, in the “Main Concepts” document. You should find most of the answers to your questions in this document. But I’ll try to summarise them below :slight_smile:

Worlds are never unloaded from memory, if not done explicitly by you using the API. When you load a Secondary World, you can also decide if it can Tick when in “Background” or not. It’s up to you and your needs.

Secondary Worlds are not “sub-levels” of the Main World (I mean “sub-level” in the sense of the UE4 nomenclature). Secondary Worlds are completely independent levels (that - if you need - you can compose using “sub-levels”). But they’re completely independent by other Secondary Worlds or Main Worlds.

You can get an idea of it looking at the Example Project on GitHub.

As written in the linked documentation above (section “Active World”):

At any time, exactly and only one UWorld is “interacting with the user”, meaning it’s receiving the player’s inputs and rendering to its viewport.

While only the Active World is visible and interactive for the local user, other Worlds - if configured appropriately - can Tick independently while in Background. Background worlds cannot be visibile on screen (BUT READ BELOW) and the user can’t DIRECTLY interact with them (but, if you configured them to tick, you can manually forward the wanted inputs to any other World - simply retrieve a pointer to the user Pawn in that World and call its methods, very simple).

NOTE: We’re working on an update of the plugin that will add support to rendering from other non-Active worlds. This allows you to implement nice visual transition effects when switching between worlds, to have “surveillance camera” effects (rendering from cameras in other non-Active worlds), etc.

I hope the above explanations answer to your question. If not, or if you need more details, please write us. If you want to describe your use-case more in detail, and want to keep it reserved, you can also reach us at .

MultiWorld plugin is participating to the Unreal Engine Massive Marketplace Sale and is 30% OFF right now. If interested, get it before the end of event.

^ This ^

If its technically possible and you change your mind and add it later on, please post here where there’s an example of why it’d be useful to have secondary worlds replicate. Cheers

Hi! Thanks for linking the other thread. We post updates about the plugin here, so follow this thread if interested. BTW, as already wrote before, it’s not a simple “change your mind” problem :slight_smile: .

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Hi everyone! We plan to submit for review the update of “MultiWorld” plugin for UE4.27 in ~2 weeks: compared to our other plugins, this is more complex and updates require more work :slight_smile: ; we’re finalizing the new features to capture scenes from other worlds and we would like to pack them together.

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The new version 1.1.0 of MultiWorld is now available in the UE Marketplace (for UE4.26 and UE4.27). In addition to add support for UE4.27, it introduces the new important features:


Version 1.1.0

New features:

Bug fixes:

If you play with the new visual transition system, post a video here! :slight_smile:


Added 2 new screenshots to explain the new features:

Hi! Following the release of our latest plugin, we launched an official Discord server dedicated to our plugins .

If you’re using the MultiWorld plugin, join the server to be informed of updates and special offers, in addition to have a quick and preferred channel to chat with us:

Discord server:

If interested, our latest plugin is Google Analytics Measurement Protocol: a native cross-platform solution to send data to Google Analytics, supporting also PC and consoles.

As part of the UE Marketplace Black Friday, some of our plugins are :fire: 30% OFF :fire: now through December 3:

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