Known Issues

Unreal Engine 5 Known Issues

Currently Varjo recommends using Unreal Engine version 5.1.1 as the most stable and performant for production.

Lumen (Deferred rendering) is not supported with the quad view

Fix coming with Varjo Unreal Engine 5.3 plugin.

Workaroud for current plugin:

1. Switch your project to Deferred rendering to use all Unreal Engine features such as Lumen GI and Nanite particularly.
2. Disable the quad view to make Lumen and Unreal Engine postprocess work.

Disabling quad view in Unreal:

The temporary work-around is to change the code of the project by removing XR_VIEW_CONFIGURATION_TYPE_PRIMARY_QUAD_VARJO from line: https://github.com/EpicGames/UnrealEngine/blob/4.27/Engine/Plugins/Runtime/OpenXR/Source/OpenXRHMD/Private/OpenXRHMD.cpp#L56 and by removing the line: https://github.com/EpicGames/UnrealEngine/blob/5.1/Engine/Plugins/Runtime/OpenXR/Source/OpenXRHMD/Private/OpenXRHMDModule.cpp#L463

Image “jittering” happening in Unreal Engine 5.2.-5.3.

The fix coming in new version of Varjo Base. Stay at Unreal Engine 5.1.1 version.

Instance Stereo Rendering ON - gives depth occlusion glitch in focus area when using Nanite (quad view)

Workaroud for current plugin:

1. r.Nanite.MultipleSceneViewsInOnePass=0 Disable in Unreal Engine 5.3
2. Disable ISR
3. or Disable Nanite

Nanite flickering glitch effect with ISR switched ON after migrating project from previous version 5.0

Workaroud for current plugin:

1. Disable ISR
2. Restart editor
3. Re-enable ISR.

Vive trackers not working in Unreal Engine 5.0

Update the engine version, was fixed in Unreal Engine 5.2.

VR Pixel Density is not implemented for OpenXR in Unreal Engine 5.0

Update the engine version, was fixed in Unreal Engine 5.1.

Flickering of shadows outside foveation square. An issue when there are shadows only in one eye while using dynamic lightning in Unreal Engine 5.0.

Update the engine version, fixed in Unreal Engine 5.1.