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Issue with loading Level Stream instances using blueprints

So I'm trying to make a procedual level just like what is explained in the first part of this tutorial: Procedual room generation

Most of it is taken from the tutorial. What I've added was a string to set the name each instance. Then I've added a "create Instance" node and added the "get streaming level" which I did by dragging my level stream from the "levels" subwindow into the blueprint. I hooked that and the string to the "create Instance node" and added a "level transform" referencing the generated instance and the transform calculated for each tile of the level.

alt text Inside the editor the meshes of both levels referenced in the blueprint are visible. But when I play my map there is nothing there.

My blueprint can be seen here. This was done in the level blueprint of the main map. Blueprint

Anyone know what I'm doing wrong? Note that I tried packaging my project and launch it but there is still nothing to be seen. Thanks in advance!

Product Version: UE 4.8
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asked Aug 01 '15 at 06:18 PM in Blueprint Scripting

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Mootjuh
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avatar image ddvlost STAFF Aug 02 '15 at 07:28 AM

I don't see where you actually load your level instances. LevelStreaming object returned by CreateInstance node has two properties you need to change: ShouldBeLoaded and ShouldBeVisible need to be set to 'True'.

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3 answers: sort voted first

I managed to get it working by adding in a 'Load Streaming Level' node

alt text

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answered Aug 02 '15 at 07:45 AM

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Anadin
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avatar image dex3r Aug 04 '15 at 10:27 AM

What are you doing here does not make much sense. You are Loading a level and then creating another instance of the same level. What you should do is to create level instance with unique name, set level transform, and than load that instance using LoadStreamLevel with just created unique name for your instance.

avatar image Anadin Aug 04 '15 at 11:12 AM

Thats the point, its to instance the same 'room' multiple times without re-loading it. It could be done with BP's per room but the OP wants to use levels.

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Do you have scene components in your persistent level where player starts?

You probably need to load first level where player starts in the construction script so it is loaded by time player spawns then streaming levels should work as needed from there

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answered Aug 02 '15 at 02:16 AM

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SolarVelocity
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Thanks. That did the trick, although it only loads the level stream once.

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answered Aug 02 '15 at 11:25 AM

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Mootjuh
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avatar image Anadin Aug 03 '15 at 03:51 AM

OK made a change and I have it alternating between each level 3 times here, (using MOD to alternate even/odd)

alt text

alt text

avatar image Mootjuh Aug 03 '15 at 09:42 AM

That setup just spawns two levels for me, not six.

This what I have so far. Video The issue is the create instance node does not want to create a new instance of a level that had an instance created before. Only if I were to unload that level it creates the instance.

avatar image Anadin Aug 03 '15 at 12:49 PM

Thats super weird, perhaps a bug? which version of UE are you one, I am 4.8.3 on OS X. I can spawn any combination of levels, I did the alternate ones just to show that its working with more than one level and repeating them.

avatar image Anadin Aug 03 '15 at 12:53 PM

Can you send a screenshot of your new BP? are you doing it in the level BP of the Persistent Level?

avatar image Mootjuh Aug 03 '15 at 01:18 PM

I am using 4.8.3 on Windows 10.

Here is what you suggested and resulted me in just 2 level instances. alt text

Here is the blueprint I have used for the video mentioned before. alt text alt text alt text

I have also modified the ForEachLoop node making the next loop start once the previous level instance is completely loaded. alt text

And yes this is all in the level BP of the persistent level. The level stream blueprints are empty.

avatar image Anadin Aug 04 '15 at 07:03 AM

OK in your version of my BP, you need to hook up all of the SET nodes to the return value pin of the Create Instance, so they operate on the instance that you have just created

alt text

I realise my first screenshot made that hard to see, sorry (also I made the same mistake when I first made it) :)

avatar image Mootjuh Aug 04 '15 at 12:19 PM

Thanks, it worked!

avatar image dex3r Aug 04 '15 at 10:30 AM

Please do note, that Indirect Lightning Cache and Lightprobes do not work when your level is tranformed. https://forums.unrealengine.com/showthread.php?2712-Streaming-levels-with-an-offset

avatar image Mootjuh Aug 04 '15 at 12:18 PM

Yes, I will have to use full dynamic lighting, the first video showing how to make such random levels in the first place shows how to do it efficiently.

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