VR Preview in UE5.1

Development Pipeline & Plugins
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1

Every time I attempt to preview a VR scene UE crashes immediately. I am having to build a desktop app whenever I want to view my scene which often takes forever. How do I fix this? Or is there another way to view my scene beyond these 2 options. I have seen that this is possible in this video:

I am using UE 5.1 with lumen and nanite active using the settings in the above video. I am also using SteamVR and have added my scene to the UE VR template (the crashing also took place in the template before adding my assets).

2

Hi James,

When you crash, what error/callstack are you seeing? Also, what version of the 5.1 preview are you currently on?

Cheers.

3

Hi, thanks for your response and apologies for the late reply. I didn’t see any email notification. Here is what I see in About Unreal Editor - Version: 5.1.0-22346211+++UE5+Release-5.1. And here is the crash report I see when UE shuts down. Hope this helps.

Assertion failed: DepthSwapchainDesc.Extent.X == SizeX && DepthSwapchainDesc.Extent.Y == SizeY [File:D:\build\++UE5\Sync\Engine\Plugins\Runtime\OpenXR\Source\OpenXRHMD\Private\OpenXRHMD.cpp] [Line: 2190]

UnrealEditor_OpenXRHMD
UnrealEditor_Renderer
UnrealEditor_Renderer
UnrealEditor_Renderer
UnrealEditor_Renderer
UnrealEditor_Renderer
UnrealEditor_Renderer
UnrealEditor_Renderer
UnrealEditor_Renderer
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_RenderCore
UnrealEditor_RenderCore
UnrealEditor_Core
UnrealEditor_Core
kernel32
ntdll
4

Thanks James,

Try changing these project settings:

Default screen percentage mode for realtime editor viewports: MANUAL
Default screen percentage mode for non-realtime editor viewports: MANUAL
Default screen percentage mode for mode for path traced editor viewports: MANUAL

(I don’t see the last one in my settings, maybe path tracing needs to be turned on for it to show up.)

Cheers to @Spcarso for posting this fix.

5

Amazing, this works! Thanks so much for this solution.

6

Glad to hear it,

For anyone seeing this thread after, this was only a problem in the 5.1 preview builds and VR Preview should work without changing any settings in 5.1.0.

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