I see a lot of 'w00t 7000fps!!' , type posts, but was wondering what is the best fps that the eye can actually see?
A friend says ithe brain only processes about 30, but that you need around 90 to really fool the brain.
Can anyone expand on this?
Also whats the best refresh that most monitors do? and is this relevant?
Thanks in advance.
Differs from man to man.
Besides of other image attributes eye is able to percieve movement "smoothnes" by special cells. Interesrinly eye is able to percieve even sound sio there are many factors. It is said that in general 60 fps are needed to fool normal population. It is said tht some poeple are able to "sense" 120 Hz strobe of some fluoresent lampos so it can vary. The golden rule is faster the better. This is same for refresh rates, i cant stand people who play games at 60 hz because of OGL app defaulting to this on windows. Crank it up to the max monitor can handle, the faster the better, i believe.
A TV plays at 24.7 FPS
A computer screen works differently, and we can detect the beam going across if it moves too slow. This is NOT FPS though.
Even 10 frames/sec (That is INSTANT frames, not possible to make on a computer miind you!) are extremely hard to detect, prvided the difference between the frames isnt black->white
60 FPS is way above what anyone can perceive, but 60Hz and more is required for computer screens, as they do not update the image instantly but instead redraw it.
An american experiment showed that a person can in theory (only one test subject managed) detect arcs of light that are less than 10 femtoseconds long.. a femtosecond is really really really short. (Unsure of the english word though, it might be something different..)
Note that this is from black room, to arc f light in black room.. Not a movie where you go from one frame to another with very little difference..
Also, our nerves arent very fast really, then add to that the brain processing what's going on..
"It feelt like times slowed down" is actually the brain skipping "frames" from the eyes when too much is going on...
On computers, you also have timebased movement in most/all modern games, this means that the higher framerate the engine can run at, the smoother movement you get. While the image only needs to be updated 60 times/sec, having it at that could in theory yield skipping/jerky movement which is not desired.
And there's no computer screen that can do 700hz, which would be what 700fps is
of course what they mean is 7,000 frames to the video memory...I think :-?
Quote:"It feelt like times slowed down" is actually the brain skipping "frames" from the eyes when too much is going on...
Wouldn't that make time seem faster? I always thought it was the brain taking in more information when a lot is going on, so you experience more within the given time frame.
I'm really sensitive to different frame rates... When I look at a screen, I can tell the difference between PAL (European) video at 25FPS with two fields, NTSC (US/Japan) video at 30FPS with two fields, US Progressive Scan at 30FPS with one field, and film at 24FPS...and a lot of other formats like HDTV/1080i/1080p/etc.
Most people I know don't see much of a difference though.
Some people (like me) can see the difference between a refresh rate of 60hz and a refresh rate of 85hz on a monitor. The same goes for game framerates. But what people like to do is clock framerates in terms of inner loop executions which is a stupid method that only serves to say "hey my penis is bigger than yours". True FPS is the number of frames rendered to the screen that can be seen, which is why true FPS can never be more than the refresh rate of the monitor and selected mode. Any time you see "ZOMG I GOTZ 70000000FPS!!!!!!!!!!!!!!!!111111111111oneoneone", it's complete bunk.
Quote:I'm really sensitive to different frame rates......CONDENSED....
Most people I know don't see much of a difference though.
I find this with DVD/DVB, i think the quality is horrible, but most people don't seem to notice till they see something like a huge fireball that really shows just how bad it can be.
Quote:Any time you see "ZOMG I GOTZ 70000000FPS!!!!!!!!!!!!!!!!111111111111oneoneone", it's complete bunk.
This was kind of what i was thinking, and i wondered just how many fps is actually necessary.
Quote:This was kind of what i was thinking, and i wondered just how many fps is actually necessary.
No more than the refresh rate of the monitor. More than that would be wasteful since they wouldnt even ever be shown.
Though you can most likely do with fewer than that.
Innerloop fps counters are needed for development though, so you can work to get the framerate up for the rendering process so you can spend more processing time elsewhere.
But when there are legitimate claims of very high fps rates, it isnt useless just because we cant detect that high. It means that more things and detail can be added and a high frame rate would still be achievable. 60 Fps may be fast enough to see by, but who wouldnt want an engine that could perform at 7000fps?!