Is Motion Reprojection basically a reqmt these days?

[Keith Briscoe]

Was continuing testing with settings and found that I have to have OpenXR motion reprojection on (unlocked) to keep smooth visuals.

I have 14900 and 4090 with reverb g2.  I can use pretty high graphics settings in game (lowering doesn't seem to impact) and I get 90 fps at times, mid altitude and away from stuff, but when I look to sides or generally fly lower it goes to 45.  I'm not complaining because it l9oks good and is quite smooth.

Just wondering if it is in fact the motion repro that is a requirement. Only other detail for my settings... I'm using 120% resolution (gosh, can't remember which app was used to set that)... that may be one more thing I'll test reducing to 100% and turning off motion repro.

What are the downsides if any of motion repro? perhaps none!

[kablamoman]

I don't like it because it introduces different kinds of artifacts, depending on the tech being used. Legacy reprojection on my Index simply inserted an extra frame, interpolated rotationally, and this resulted in ghost images/trails for faster moving objects. The newer motion smoothing also tried to correct translational motion as well, and introduced a lot of weird effects in flight sims like a warping effect around a propeller, etc. I haven't really bothered with any of the oculus spacewarp stuff, nor have I experienced OpenXR or WMR implementations, I just try to avoid it.

I have the same processor/GPU combo, and I've been tuned to maintain 80hz, 75hz and later 72hz without any reprojection or spacewarp, first on an Index, then a bigscreen beyond, and then on a Quest 3, respectively.  It's just a matter of maintaining below the frame time threshold. 90hz is a higher minimum to maintain and to do so you may have to lower resolution (if your GPU is the bottleneck) or maybe some of the more computationally expensive visual settings like view distance, if it's your CPU dipping below the threshold.

Edited April 25, 2024 by kablamoman

[Phantom711]

No, it is not a requirement, just personal preference.

do you rather accept stutters, when FPS drops below refresh rate or do you prefer some visual artefacts/wobble etc. with MR kicking in? Pick your poison!

[Keith Briscoe]

Yeah, pick your poison seems to be a good phrase here.  I'm about 2 weeks or so into VR - absolutely loving it - but still figuring out which and how settings / apps / features contribute or take away from the experience.

 

[Chief_Biv]

I found that the G2 was unpleasant without MR as soon as it dropped below the headset's refresh rate and preferred the smoothness that MR provided over the smearing/ghosting artifacts. If I had a 4090 I would have turned down some eye candy to keep above 90fps. VR without MR = eye candy.

[Dangerzone]

12 hours ago, Keith Briscoe said:

Was continuing testing with settings and found that I have to have OpenXR motion reprojection on (unlocked) to keep smooth visuals.

I have 14900 and 4090 with reverb g2.  I can use pretty high graphics settings in game (lowering doesn't seem to impact) and I get 90 fps at times, mid altitude and away from stuff, but when I look to sides or generally fly lower it goes to 45.  I'm not complaining because it l9oks good and is quite smooth.

Just wondering if it is in fact the motion repro that is a requirement. Only other detail for my settings... I'm using 120% resolution (gosh, can't remember which app was used to set that)... that may be one more thing I'll test reducing to 100% and turning off motion repro.

What are the downsides if any of motion repro? perhaps none!

Almost same setup as mine (I have a 13900). 

I found that turning MR off gave me 90fps consistently in almost all scenario's. (Where with it turned on the GPU/MR app thought it couldn't reach 90FPS for some reason, and kicked in MR early - where I was running MR the majority of the time). 

My recommendation is to try turning off MR (not on auto - but actually OFF), and see if you're able to get graphics set to a point where you can get 90fps consistently. Then it's not an issue because there's nothing to reproduce. 

The only difference is I'm only using 100% resolution.

 

[jurinko]

Go for Q3 and you can run at 72Hz without reprojection almost all the time. 

[edmuss]

Test out 60Hz refresh rate, there is a display panel associated with it in the G2, some people can stomach it, some can't; if you fall into the former camp then welcome to refresh rate DCS VR
Also try running QVFR (https://github.com/mbucchia/Quad-Views-Foveated/wiki) with a fixed foveation as it saves a big chunk of performance.

[Eugel]

I was using MR for years, because I couldn´t keep above 90 fps.
Unfortunately, after the switch from SteamVR to Open XR, I got way more weird artifacts and distortions from MR, especially while flying helicopters it gets very annoying.

Now I switched from 90 Hz mode with MR to 60 Hz without MR and it is much much smoother. So if you can stand the 60 Hz mode, it´s worth trying as your computer most likely won´t drop below 60 fps, even with relatively high settings.

[average_pilot]

Also playing at 60 Hz here, for years now since my first WMR headset. I can't tell the difference anymore. That's a very big slice of performance to be gained.

VR resolution has a very high impact in performance. Find a good balance.

The OpenXR Toolkit gives you fixed foveated rendering that helps quite a lot with performance while keeping a rather high resolution, of course in exchange of visual quality. The other type, QVFR, doesn't give me any extra performance but rather a performance hit.

It's a question of testing things and eventually finding what works for you personally. It can take years.

[BIGNEWY]

I disable motion reprojection and use 90hz 

It is a personal preference 

[j9murphy]

I too ended up turning off motion reprojection on my crystal and adjusting settings to maintain 90fps at 90hz... no smearing of ground objects at all now when flying low and looking out the side window - much better!

[AlpineGTA]

Yes, 60Hz mode on the G2 is a big performance boost. It's a pity all headsets don't have it. I run my G2 using OpenXR Toolkit without motion reprojection at 60Hz, with smooth visuals and some fairly nice eye candy, on a 6900XT. It runs and looks much better than my Quest 2 at 72Hz.

[j9murphy]

I wish I could run the pimax @72hz - It's capable of doing it of course, I just get eye fatigue more quickly and the quality of the image seems less natural (kind of the way 60hz/72hz is  different than 120hz on a 2D screen.  It's a me problem lol, i'm just too sensitive to the lower refresh rate.

[Keith Briscoe]

Thank you all sooo much for the input... I just tried the 60hz with NO motion repro.  A bit lower graphics settings within DCS.  With this, I get perfectly steady 60fps, pretty good eye candy, and basically no stutters!  Very cool.  I feel I can maybe tell "something" different than the 90hz but I have a feeling I would get used to it, and certainly no bad eye or head effects yet.  Going to try this a bit more and see if it's the right balance.

Then, go back and re-try the 90hz WITH motion repro.

@BIGNEWY @Dangerzone  For you two on 90hz... would you care to share what other in-game (or other) graphics settings you've adjusted down to help you maintain 90 fps?

Thanks again.

[edmuss]

@Keith Briscoe if you want to fine tune your setup, use openxr toolkit advanced performance overlay and pay attention to the appgpu frametime number.

For 60Hz I would recommend aiming to keep a minimum of 65fps to give you a little overhead. For this you want your appgpu to be less than 15.4ms, adjust your settings accordingly in the worst case scenario you fly in and you can bask in buttery smooth VR

[actually_fred]

On 4/26/2024 at 7:06 AM, average_pilot said:

The OpenXR Toolkit gives you fixed foveated rendering that helps quite a lot with performance while keeping a rather high resolution, of course in exchange of visual quality. The other type, QVFR, doesn't give me any extra performance but rather a performance hit.

Usually QVFR will help (a lot!) if you have spare CPU but your GPU is maxed out, but it will hurt if you don't have spare CPU. VRS (like in OpenXR Toolkit) has smaller savings, but also smaller costs.

[Keith Briscoe]

I think I found a combo of settings that work... and I believe the key was to shift to 90% resolution in the OpenXR tool for WMR.  Now, I can run at 90hz, keep very high settings in-game, and so far maintaining 90fps.  Did some MP, and will test more, but so far so good!!

VR is the best!