Visual glitch with VR and depth of field

Development Platform & Builds XR Development
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1

Hello, in UE5.5.4, we noticed a visual glitch in VR when using this CVar: r.DOF.Gather.ResolutionDivisor 1. Setting to 2 hotfix the issue

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Is it a known issue, or planned to be fixed? If so, could you hint us some information for an engine change?

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See repro-steps below

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Thank you!

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Jonathan

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2

Steps to Reproduce

  1. Open level GlitchDOFinVR. Only changes from ThirdPersonMap is depth of field settings in the Post process volume
  2. Enable Emulate Stereo in Editor preference
  3. Launch stand alone
  4. Notice glitch on the right eye render
  5. Console command: r.DOF.Gather.ResolutionDivisor 2. Now notice there is no glitch

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3

Hi Jon,

Thanks for the report, I’ve created an internal ticket to track this issue. We generally do not recommend using DOF in XR projects since it tends to be disorienting when viewing stereoscopic 3D content, so this is not a commonly tested path for us and I can’t offer a timeline on a fix. If you want to troubleshoot it a bit yourself, I’d start by seeing if the issue goes away when disabling Instanced Stereo - this is a common source of post-processing bugs, although disabling it may impact your project’s performance. (The performance benefits of Instanced Stereo are highly project specific, so I recommend profiling performance with and without it enabled to see if having it enabled is preferable for your project separate from this issue.)

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