this post was submitted on 21 May 2024
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I remember people talking about 1000hz being the holy grail for vr headsets, though so it seems like there's more consensus on 1000 Hz being a good limit. Frame time is just the inverse of hz.
But yeah ive personally only used 144hz, I think I could see a difference with 204hz, but I'm not sure if I'd be able to discern 480 or 1000hz outside of maybe VR.
There kinda isn't really any definitive science that indicates a specific frame rate that the eye can perceive.
There are studies however that show ranges from 30 to 90hz, and studies that show that human perception can detect flicker at up to 500hz even.
The issue is that nothing that happens in the real world is synchronized with what you perceive. So filling in with more Hz means there are more chance for you to actually perceive the thing.
To complicate matters further, our brains do a lot of filling in for us, and our eyes and brains can still perceive things you aren't consciously perceiving yourself. So again more frames is always nice.
Here are some sources
Canadian Centre for Occupational Health and Safety. (2020). Lighting Ergonomics - Light Flicker.
https://www.ccohs.ca/oshanswers/ergonomics/lighting_flicker.html
Davis J, et al. (2015). Humans perceive flicker artifacts at 500 Hz.
https://doi.org/10.1038/srep07861
Mills M. (2020). How Many Frames per Second (FPS) the Human Eye Can See.
https://itigic.com/how-many-frames-per-second-fps-human-eye-can-see/
Sure, eyes dont have a "global frame refresh" like computers do. That's why we can tell the difference between 24hz and 60hz video. Every eye cell is excited independently and continuously.
Still, there's a physical limit for frame time where 99% of humans wouldn't notice a full screen flash 99.9% of the time. Being able to shake your head around with a 1000hz vr headset and not perceive and motion blur from sample and hold seems pretty close to that limit.
That's still going to depend on the frame rate of the output source. If the source is only 200fps having 1000hz isn't going to matter a whole hell of a lot.
If you're using a game that renders each frame at an instant in time, and the aim is to get a better approximation of true motion blur to your eye, the theoretical maximum for getting smoother motion blur is gonna be when the thing is moving at one pixel a second, which is higher than the rate at which we can distinguish between individual images. Well, okay, maybe a bit more, since you could hypothetically have sub-pixel resolution.
But point is, more rendered frames does buy you something even past the point that they're not individually distinguishable, unless the game's rendering engine can render perfectly-accurate motion blur itself.