OpenXR: Change fb foveation level at runtime.

Development Platform & Builds XR Development
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https://github.com/EpicGames/UnrealEngine/commit/be2f181f34f2a6e0a997ef5201e2076c20821240

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“These CVars can be switched back to runtime-toggleable after OpenXRHMD RDG synchronization issues are addressed.”

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What’s the current progress on this issue?

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Use c++ to set these CVars instead of ExectureConsoleVaribal at runtime，will cause crash on vulkan render pass. ​

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Some our developers want to set different foveation level on different game world (ULevel).​

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Hi Seamus,

A fix for this issue is also tentatively scheduled for a 5.9 engine release. I’ll update you here once a fix is submitted to main.

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Hi Seamus,

I recently investigated this and was no longer able to reproduce the issue which led us to limit the CVars. I’m having QA confirm that they also can’t repro, but in the meantime, I’ve removed the ECVF_ReadOnly flags from the CVars in UE/Main in CL 58400770.

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