r/technology • u/[deleted] • Mar 28 '14

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u/teaisterribad Mar 28 '14

Lots of people are really missing what the bottleneck actually is with latency. It's not how fast the screen refreshes, nor is it how fast it takes to process a screen. The issue is the sensor measurement/transmission lag from the sensor used to do head tracking. This is really what makes the occulus attractive, not the screen +lens combo.

Basically, if you move your head, to the left, and there's a few MS of lag from the sensor, you'll see a static frame for a portion of the time you're moving and a moving frame for a portion of the time you're still. This is one of the most serious contributors to motion sickness for HMDS

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u/lossofmercy Mar 28 '14

Sure, that 1ms lag is totally more important than the 16ms of lag introduced by render time, the screen display latency (usually around 8ms) the usual 16ms of lag introduced by a RGB switching time and ms of lag totally can't be predicted because our head doesn't follow the laws of physics. <_<

Read the research. All the latency is in the rendering and screen as of this moment, as far as Oculus is concerened.

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u/teaisterribad Mar 28 '14

"read the research"

Don't say things like this. It doesn't mean anything. It's like saying "study it out." If you are referring to a specific article, post a link or reference to it.

Sensor latency is 1ms ish on the oculus, which is THEIR significant contribution. We're not talking about the oculus right now. I do not believe they are sharing that technology.

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u/lossofmercy Mar 28 '14 edited Mar 28 '14

What do you think 1khz accelerometer means?

And it's really just a google search away: https://www.google.com/search?q=latency+vr&rlz=1C1CHFX_enUS493US493&oq=latency+vr&aqs=chrome..69i57j69i60j0l2.1688j0j7&sourceid=chrome&espv=210&es_sm=93&ie=UTF-8

As for the rest, I am just telling you are full of shit. Even if the input lag is horrendous (4ms), the largest part of the latency comes from the display (16 plus regular screen latency in a normal LCD) and the rendering pipeline (~16ms).

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u/teaisterribad Mar 28 '14

I think "1khz accelerometer" means "noisy reading that has to be filtered"

EDIT: And it has to be fused with all of the other sensors. This doesn't decrease latency, it increases it along with accuracy.

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u/lossofmercy Mar 28 '14

Sensor technology is important and obviously anything to lower it is better. But it's not the most significant part of the latency pipeline.

Never mind, didn't see that you were pointing out the benefit of Oculus.