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?
Hi!
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. 
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
Hi!
Of course there are technical reasons for deferring the deletion of a World, otherwise we would have deleted it directly 
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 support@unamedia.com .
Test post to check EDIT permissions in the new forums (sorry for the bump!)
Hi,
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
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 support@unamedia.com .
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.
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 .
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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 ; we’re finalizing the new features to capture scenes from other worlds and we would like to pack them together.
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Hi!
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:
-
the new StartTransition() function allows you to run nice animated visual transitions when switching worlds
High-res video: Visual transition effects when switching UWorld with MultiWorld - YouTube
And you can use your own ordinary UE material to customise the effect! Check the updated demo project for an example.
-
you can now capture scenes from Background Worlds and use the render targets as you prefer (documentation).
Changelog
Version 1.1.0
New features:
- You can now change the Active World playing a nice and customizable visual transition effect. Read more on Visual transitions on World Switching .
- You can now capture scenes from Background Worlds, using the render targets as you prefer. Read more on Scene capture .
- It’s now safe and supported to call UMultiWorldStatics::EndWorld() on the Active World (in this case UMultiWorldStatics::ReturnToMainWorld() is called automatically).
Bug fixes:
- (breaking change) Removed the property
bDuplicateOnLoadfrom FMultiWorldLoadParameters: duplicating packages with cooked data could cause errors at runtime, so now the package is renamed with an unique name instead of duplicating it. Note that this implies that calling UMultiWorldStatics::LoadWorld() a second time on an already loaded map will force a new load of the corresponding package. - Fixed an issue when UMultiWorldStatics::EndWorld() is called on a ticking world while PIE.
- Fixed a possible assert on UE4.26 when FMultiWorldLoadParameters::bCreateDedicatedAudioDevice is
false.
If you play with the new visual transition system, post a video here!
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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: https://discord.gg/PuAyhDctHp
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 
30% OFF now through December 3:
MULTIWORLD
MIXAMO ANIMATION RETARGETING
GOOGLE ANALYTICS MEASUREMENT PROTOCOL
Remember to join our Discord server for other news: https://discord.gg/PuAyhDctHp
Hi! The new version 1.2.0 of MultiWorld is now available in the UE Marketplace (for UE4.26 and UE4.27). It introduces few improvements to the customisable visual transitions effects and some important bug fixes.
Changelog
Version 1.2.0
New features:
- Material Instances are now supported by UMultiWorldSeamTransition (see Visual transitions on World Switching).
- New parametrised materials, to be used with UMultiWorldSeamTransition, are provided with the plugin.
Bug fixes:
- If no Audio Device Manager is detected, all Secondary Worlds will share the same audio device of the Main World (thanks to Luben for the report).
- Fixed
UWidgetComponentappearing also as 2D widgets on screen when switching the Active World (thanks to lovewater for the report). - Fixed missing calls when closing a Secondary World (in particular:
EndPlay()on actors and flushing of streamed levels). - Render Target textures used by UMultiWorldSeamTransition are now properly resized if the viewport size changes between distinct transitions.