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How close are we to being able to render a high resolution monitor / TV inside VR? Not necessarily a 4K screen, but like a good 2560 x 1440 display? How close are we to high resolution virtual cinema experience?

... or are we there? I really have no idea how resolutions in VR work.

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VR headsets don't have that level of resolution yet. There will still be visible pixels for years to come. I believe it was either Carmack or Gabe Newell who said you'd need nearly 50k vertical pixels for true photo realism, I may be mistaken though.

An AMD study said you'd need a 16k display for 4k-like quality over a full human FOV

If you want to render at 2560x1440 inside of VR and not lose quality the VR resolution has to be bigger per eye than display resolution. You would need a VR headset that has 4k per eye rather than a better GPU.

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