Strange vr issue

[ddwg72]

not sure what is causing it but I have a strange issue could use some help figuring out.  I get bad stuttering in VR but only when the window is in focus and I move my head.  I have the Pimax 8kx/3090 ect.. I tried Smarth Smoothing off and on.  It is not bottlenecking as frames, ect.. all work great and the game runs great as long as I dont move my head but when I do I get bad suttering/ghosting and only in DCS even though frames stay the same.  It works great when not in focus with no stuttering when looking around.  Anyone have an idea of what to look at or run into this before?

Edited April 28, 2021 by ddwg72

[Dave317]

I think a lot of us have this issue.  It seems almost perfect when not in focus, not sure what's causing it.

[ddwg72]

I need to keep testing more but I turned of g-sync on the set up g-sync tab and not just turning off v-sync on the manage 3d settings and it seemed to get rid of it.  Will need to do more testing but work keeps getting in the way of proper testing.. need to send an email to my boss about work interfering with dcs time.

[Fri13]

The whole view like "stuttering"? If it is like double drawing the frames only when you move head, then that has existed since Rift CV1.

 

It happens sometimes that VR device gets to odd mode where the tracking is no good and all. 

I have tried to source that for years, but what I have found is that it has something to do with the DCS World process and memory how it connects to Oculus software. Because sometimes it starts right middle of the main menu, sometimes after loading a mission. And main way to get rid of it is to shut down the DCS. And when DCS process is killed, even the Oculus main menu can stutter same way for a while, and then like 15-30 seconds after that it is all away. Launch DCS again and it works correctly. 

 

One time it was such that you got away of it by triggering the proximity sensor in the VR to shut off the lenses and then back. But it doesn't work always.

[Eugel]

17 hours ago, Fri13 said:

The whole view like "stuttering"? If it is like double drawing the frames only when you move head, then that has existed since Rift CV1.

 

Isn´t that simply when the computer can´t provide enough fps ?
I get this all the time when I drop below 45 fps (in the Reverb G2 with motion smoothing enabled) but I also had the same effect with the Vive and Vive Pro when my framerate is below a certain threshold.

It´s just when you move your head or while looking to the side in a fast moving aircraft, you notice it more.

 

Not sure if that´s the problem here. @ddwg72 what do you mean by "in/out of focus" ? Have you tried pressing alt+enter to enable full screen ?

[Fri13]

7 minutes ago, Eugel said:

Isn´t that simply when the computer can´t provide enough fps ?

 

The mirror view of the DCS will show a great high FPS, even the constant 40 FPS if locked to it. 

It is not that PC can't produce enough FPS as everything is perfectly smooth when you just keep head stationary. Once you start to turn head it starts to draw double frames. It is easy to see in the circular movements that there are two frames drawn, the new one and then previous one, new one and previous one. So it is not that you are dropping frames as it is not just low frame rate but previous frames are drawn and it makes it look ghosting and jittery. But it happens only if the head is moving, so something to do with the tracking. Increasing illumination or spotlights are not a cause or solution for it. 

[Eugel]

14 minutes ago, Fri13 said:

 

The mirror view of the DCS will show a great high FPS, even the constant 40 FPS if locked to it. 

It is not that PC can't produce enough FPS as everything is perfectly smooth when you just keep head stationary. Once you start to turn head it starts to draw double frames. It is easy to see in the circular movements that there are two frames drawn, the new one and then previous one, new one and previous one. So it is not that you are dropping frames as it is not just low frame rate but previous frames are drawn and it makes it look ghosting and jittery. But it happens only if the head is moving, so something to do with the tracking.

 

Not necessarily. Let´s say your computer does only 30 fps. If you move your head only 5 degrees to the right, it will show you 6 frames for every degree of movement and it might look perfectly fine and smooth, but if you move your head real fast 90 degrees to the right, you will now only see one frame for every 3 degrees of movement, which can look choppy.

It´s easy to check, fly low to the ground in a fast moving aircraft and hold your head steady to the right, if there is still stutter/ghosting, it´s not the tracking, but low framerate.

 

And the effect on the monitor is different, 40 fps on a 2D monitor might look ok, but in VR it´s terrible (without motion smoothing)

The rule of thumb is you want steady 90 fps in VR, whether it´s native 90 fps or 45 with interpolation. 

40 FPS, even with motion smoothing will create some ghosting for me in the G2 in fast moving scenes.

[Fri13]

1 minute ago, Eugel said:

 

Not necessarily. Let´s say your computer does only 30 fps. If you move your head only 5 degrees to the right, it will show you 6 frames for every degree of movement and it might look perfectly fine and smooth, but if you move your head real fast 90 degrees to the right, you will now only see one frame for every 3 degrees of movement, which can look choppy.

It´s easy to check, fly low to the ground in a fast moving aircraft and hold your head steady to the right, if there is still stutter/ghosting, it´s not the tracking, but low framerate.

 

It shows it always when the head moves, regardless even if you have 80 FPS. It is not low FPS effect. That is totally different look. 

 

1 minute ago, Eugel said:

And the effect on the monitor is different, 40 fps on a 2D monitor might look ok, but in VR it´s terrible (without motion smoothing)

 

The effect is not about low FPS. You can have 80 FPS and still you have all ghosting because double draw. The smoothing doesn't help there.

 

1 minute ago, Eugel said:

The rule of thumb is you want steady 90 fps in VR, whether it´s native 90 fps or 45 with interpolation. 

40 FPS, even with motion smoothing will create some ghosting for me in the G2 in fast moving scenes.

 

40/80 FPS is the Rift S framerates, not the 45/90 FPS. 

 

And this is very severe double frame drawing and ghosting without FPS causing it (you can have even steady 80 FPS and it is there, but only when the HMD moves, not when it stays stationary and action happens in the scene).

[ddwg72]

 Turning off the G-Sync helped but it did not get rid of the issue.  I think I did find out what caused it and it may help some others.  I turned off Hardware-accelerated GPU scheduling in the Windows Graphics settings and it removed the stuttering when the game was in focus.  Played a few missions and did a few full restarts and the stuttering never came back.  To be clear the problem I had was when the game was in focus I had bad stuttering/ghosting but as soon as the game was out of focus the game ran great.

 

[Olliecast]

Anyone manage to get a good solution to this? 
Im getting the same on my 8kx also