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EIw
Up and Coming
March 23, 2015
Question

At what PPI do all the problems go away?

I don't know as much about VR as many of you, but it would seem to me that taking a 108 P screen down to 5 inches or so would produce a retina like resolution. I've heard even this isn't enough though, and that resolutions as high as 4K may be needed.

Is that true? Translated to pixels per inch, what's needed for the eye to be unable to distinguish reality from VR?

    1 reply

    kojack
    kojack
    Honored Contributor
    March 23, 2015
    PPI is the wrong way to measure VR. It doesn't matter if you have 1080p on a 50 inch or a 5 inch screen (well, the 50 inch would break your neck). It's pixels per degree that matter. That's how the screen's pixels are spread across your FOV.
    If a hmd has a 90 degree vertical fov, then it's 12 pixels per degree (vertical), no matter what the PPI of the screen is. Apple claim that at least around 60 DDP is needed for a retina display.

    That means we'd need a 9600 x 5400 screen to get 60PPD with a 90 degree vertical fov.
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