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[Temp Fix] Cosmos Elite Crash at launch for titles/developers using Unreal Engine 4.24


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UPDATE:  The issue has been addressed with Beta 1.0.12.2 released. Here is how to change to the the BETA stream.

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There is currently an issue where Cosmos Elite users will get a crash when running applications that were built using Unreal Engine 4.24 or 4.25.
We are now tracking the issue and will report back whenever there is an official fix for it.

However, you can apply a temporary workaround for the issue as reported here: https://answers.unrealengine.com/questions/953996/does-the-unreal-engine-support-the-cosmos-elite.html
The workaround is quite simple but it can't be considered a final fix cause it may impact performances for low-end GPU users.

For game/app end users:

Just go to %USERPROFILE%\AppData\Local\{ApplicationName}\Saved\\Config\WindowsNoEditor\
and open (or create if not present) the file Engine.ini. Then add the following lines at the end of the file:

[/Script/Engine.RendererSettings] 
vr.HiddenAreaMask=false

For Developers:

Do the same thing by editing the file DefaultEngine.ini (config folder) and restart Unreal Engine

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Having the exact same issue in UE 4.26, using a brand new Vive Cosmos Elite. 

Tried the fix by modifying DefaultEngine.ini. 

Tried switching to the Beta branch of Console. 

UE and SteamVR both crash when I launch the VR preview in the UE editor.

The Valve Index has no issues running the application.  @C.T.

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On 6/9/2021 at 12:32 AM, krlsmnk said:

Having the exact same issue in UE 4.26, using a brand new Vive Cosmos Elite. 

Tried the fix by modifying DefaultEngine.ini. 

Tried switching to the Beta branch of Console. 

UE and SteamVR both crash when I launch the VR preview in the UE editor.

The Valve Index has no issues running the application.  @C.T.

Would you like to share the build or sample code that having the trouble? I can find expert to check out the problem.
We have test build with no issue with it last week.
 

Thanks

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Both of my projects were built from the VRExpansion Template project, found here:

https://github.com/mordentral/VRExpPluginExample/tree/4.26-Chaos

 

With no changes to the example project on 4.26,  the Cosmos Elite crashes both UE4 and SteamVR when running VRPrieview in the editor. 

The Index gives no trouble. 

I unfortunately cannot share my repos; they are hosted on our classified Git even though they are not classified. 

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On 6/17/2021 at 12:49 AM, krlsmnk said:

Both of my projects were built from the VRExpansion Template project, found here:

https://github.com/mordentral/VRExpPluginExample/tree/4.26-Chaos

 

With no changes to the example project on 4.26,  the Cosmos Elite crashes both UE4 and SteamVR when running VRPrieview in the editor. 

The Index gives no trouble. 

I unfortunately cannot share my repos; they are hosted on our classified Git even though they are not classified. 

Hey there, My team has build a sample app based on the github you provided, and it is working fine without crashing on our end.  
I sent it to you via your registered email already please take a look at it. 

Please let me know if it is working fine on your end. Thanks

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