Supersampling basically rescales from the original resolution. For example the RiftS res is 2560x1440 or 1280x1440 per eye. So that'd be a 1.0. Higher numbers of SS=higher res. What happens is it scales that video up and then back down to what you see in the headset. It can tend to make things look better but it has limits. Of course the display in the RiftS isn't gonna magically give you Pimax8k resolution so there's that. You're also limited to what your PC can generate too. You can set SS as high as you can but it might not be playable. In some games it can tend to make the terrain and clouds look great but you might not be able to spot other planes or other small objects at a distance.
I'm sure others can explain that a lot better than I just did. One thing I'd add tho is that, as is with other things with computers, yours is different from mine is different from somebody else's. Find a setting that works for you in a particular game and make a profile for it. Tweak from there. Don't make duplicate settings. You don't want SS of SS.
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Ok, thinking about this a bit, what you're saying doesn't sound exactly like what I'm talking about. If I understand supersampling, it renders at a higher res then puts it back through to your display's native resolution. To me that doesn't make any sense why that improves anything. It literally sounds like it's just creating busywork for your video card. You can't display more pixels than there are on the display device.
In the Rift software, it lets you set the desired rendering resolution and refresh rate. As I said before, I have a Quest 2 which has a native resolution of 3664x1920. The software allows 3 choices of refresh rate, then there is the options for resolution. 1.0 starts out at 2784x1408, which is significantly lower than native and looks noticeably worse.
It appears at 1.3 it is 3696x1872, which is the closest option to the native res of 3664x1920 I have. And that does make it look better. Like I said above about the busywork for the video card, I've gone no higher other than to see what happens as I can't see a difference other than FR drops.
Basically it looks to me on my system like it's resolution adjustment, with the option for supersampling if you go above native. So technically I think we're both right.
It's just odd to me that A) there's no native option and B) that 1.0 starts well below native. Although I'm wondering now typing it out if the software just starts at 1.0 because that's the native of one of the older headsets or something. It just seems an odd number to throw around in there to me.
Wiley.