Basic Setup – OpenXR & Pimax HMDs...

[Nahemoth]

hace 12 horas, WipeUout dijo:

Use the OXRTK FPS counter, it will give you the right picture.

 

Does not make any sense.  I have the same CPU and my CPU frametime stays around 5ms most of the time wich is way bellow 11ms (90 FPS limit).  Do you use process lasso or something similar to assign core affinity? This is not required anymore with DCS MT... or you might have something running in the background that uses your CPU?  

 

You should be able to maintain 90FPS in 95% of the time.  As an example, when I run the A-10A Caucasus instant action mission (close air support) my FPS drops below 90 only when CBUs explode within my filed of view.

Speaking of FOV, I use normal since I wear glasses and wide FOV is completely useless for me.  This will be more taxing for your system if you use the widest FOV.

In any case, you should have at least 10% better performance than me with my 4080!

I tried it again, and I don't know what I did yesterday, but now it runs as expected. The OXRTK FPS counter shows coherent frametimes, and most of the time I run at 90 FPS.

Not sure yet if I get any benefit from running at 90 Hz compared to 60 Hz, need to do more tests, but what is the adverse effect that people feels?

I also run at normal FOV, wide FOV decreases the clarity, so for me, the normal FOV is a very good trade-off. 

[WipeUout]

10 hours ago, Nahemoth said:

Not sure yet if I get any benefit from running at 90 Hz compared to 60 Hz

For me it is very subtile at 60hz and I see some vibration when looking to the sides in menus and also during flight.  At 90hz, there is some vibration in menus also but none in flight, everything is rock solid.  I sometime also use 75hz if I absolutely need to have MSAA ''on'' but that only happens on the NTTR map away from Las Vegas...  Overall, I feel less fatigue in my eyes when simming at 90hz.

[goliat26]

Guys i am new Pimax user and i try run DCS MT version with OpenXR. I have PimaxXR and OpenXR toolkit. When i run DCS with --force_enable_VR --force_OpenXR parameters on screen i have unusual size of the game window and on goggles i am on moon or any planet? wtf...

[WipeUout]

First, are you using Pitool or Pimax client?  You should use pimax client 1.10

Next, do you have a lighthouse?  If you don't, then it will work as well but only for 3DOF (head yaw, pitch and rotation).

Next, are you using the latest version of PimaxXR (0.3.4) and OpenXR toolkit (1.3.2) 

For other settings and advice, look at my post here:

There is also your hardware, what is your setup?

 

[goliat26]

42 minutes ago, WipeUout said:

First, are you using Pitool or Pimax client?  You should use pimax client 1.10

Next, do you have a lighthouse?  If you don't, then it will work as well but only for 3DOF (head yaw, pitch and rotation).

Next, are you using the latest version of PimaxXR (0.3.4) and OpenXR toolkit (1.3.2) 

For other settings and advice, look at my post here:

There is also your hardware, what is your setup?

 

I use PiTool Version V1.0.1.277 and lastest versions of PimaxXR and OpenXR toolkits.
I dont use lighthouse.

Hardware setup: i5 13600, RTX 3090, 32GB RAM. Pimax 8k Plus

I tried to uninstall all of this and run DCS by SteamVR but on Render Quality 1 and pixel density 1 i can count pixels one by one.... And when i try to change camera.... always BOOM, on right eye random pixels, on left eyes resolution like 320x240 heh...

Edited May 31, 2023 by goliat26

[WipeUout]

The 8k+ is getting a 5k image from your system and upscales it to 8k.  The image quality is much better than a Pimax 5K Super and very close to an 8kX.

Use pimax client, it is the most stable and reliable for OpenXR and you need to use the OpenXR runtime to get max performance.  I think the 8k+ and the 3090 has issues in the past, you might want to check that you have the latest firmware installed.

From an image quality perspective, you need to upscale the image close to 150% either with a PD of 1.2 in DCS or in OpenXR toolkit (resolution) to get the best possible result.  The problem is that it will require a lot of horsepower from the GPU and you will need to use FFR in OpenXR Toolkit along with motion smoothing.  Also keep your HMD refresh rate at 72hz and your FOV at normal. 

[goliat26]

1 hour ago, WipeUout said:

The 8k+ is getting a 5k image from your system and upscales it to 8k.  The image quality is much better than a Pimax 5K Super and very close to an 8kX.

Yee i know. Image quality is not bad. I have Reverb G2 and there Image clarity is of course better but in smaller sweet spot. And the "image feeling" is different. I dont know if smallest IPD on 8k+ is too big for me... In specs, smallest IPD of 8k+ is 60mm but in real is much bigger. Consequently the point i am looking at is little blurry. I have to little turn head in right (for left eye) or left (for right eye) for full focus of point. I'm afraid that disqualifies these goggles for me.
 

1 hour ago, WipeUout said:

From an image quality perspective, you need to upscale the image close to 150% either with a PD of 1.2 in DCS or in OpenXR toolkit (resolution) to get the best possible result.  The problem is that it will require a lot of horsepower from the GPU and you will need to use FFR in OpenXR Toolkit along with motion smoothing.  Also keep your HMD refresh rate at 72hz and your FOV at normal. 

First question, what is PD :)? FFR is very irritating but it will be nice to have stable 72FPS :D. Now i have about 65 with steamVR.

Edited May 31, 2023 by goliat26

[WipeUout]

6 minutes ago, goliat26 said:

First question, what is PD :)?

Pixel Density in DCS VR settings.  With a PD=1.2 you are effectively upscaling your image by 144% (1.2 x 1.2).

I use glasses which already limit my FOV, that is why I use normal FOV and it is already much larger than most VR HMD.  The IPD is weird indeed,  my measured IPD is 66 but I have to set it to 60 to get best view.  Try using different thickness face foam, this might help also.  

[goliat26]

I have setted 60mm on Reverb G2 and it is about 7mm smaller than 60mm in Pimax. Now i am using thickness face foam 11mm, i will try 15mm but i think that it will not help :(. And there is no different ways to fix it :/. Software IPD offset not helps or i cant set it... I feel that IPD is too high for me. Maybe anybody know any fix for it?

Another question is, should i use this settings?

Edited May 31, 2023 by goliat26

[WipeUout]

1 hour ago, goliat26 said:

Another question is, should i use this settings?

No need for Parallel projection, this might solve your problem!!

If you use 1.25 resolution, this equates to 1.25 x 1.25 = 156% upscale which is very demanding for a 3090.  Use the DCS PD at 1.2 instead or the resolution in OpenXR Toolkit.

[goliat26]

4 minutes ago, WipeUout said:

No need for Parallel projection, this might solve your problem!!

But which problem?

 

 

4 minutes ago, WipeUout said:

If you use 1.25 resolution, this equates to 1.25 x 1.25 = 156% upscale which is very demanding for a 3090.  Use the DCS PD at 1.2 instead or the resolution in OpenXR Toolkit.

But i have 1.25 in Pimax Client and 1.0 in DCS.

[WipeUout]

Parallel projection is not needed, this will screw your alignment and might help with your IPD problem.

1.25 in pimax client = 156% upscale

1.2 DCS PD = 144% upscale

You are better off to use 144% which is less demanding.

[goliat26]

2 hours ago, WipeUout said:

1.25 in pimax client = 156% upscale

1.2 DCS PD = 144% upscale

You are better off to use 144% which is less demanding.

Aaa so set 1 in Pimax Client and 1.2 in DCS?

 

I tried 15mm face foam but no changes with IPD problem. I saw few low IPD mods but its hard to mod.

Edited May 31, 2023 by goliat26

[WipeUout]

14 hours ago, goliat26 said:

Aaa so set 1 in Pimax Client and 1.2 in DCS?

Correct!

Did un-checking the parallel projection box in pitool helped?

[goliat26]

1 hour ago, WipeUout said:

Did un-checking the parallel projection box in pitool helped?

No changes in IPD issues. I think that only IPD mod will help for me but it's dangerous...

[goliat26]

My framerate sometimes drop from 72 to 60-65. Is turn on smart smoothing good idea or search for another FPS boost? Or maybe change Hz from 72 to 110 and then check smart smoothing for 55FPS lock?


EDIT:

I dont know how its works but... On Reverb G2 i was playing with 0,8 quality in WMR toolkit and i get about 60 FPS. In this case rerolution = 2160*2160*0.8 = 3732480 pixels per eye.

With Pimax i have 2560*1440*1.2 = 4423680 pixels per eye and i get about 65-72 FPS. How it is possible?

Edited June 1, 2023 by goliat26

[WipeUout]

9 hours ago, goliat26 said:

My framerate sometimes drop from 72 to 60-65. Is turn on smart smoothing good idea or search for another FPS boost? Or maybe change Hz from 72 to 110 and then check smart smoothing for 55FPS lock?


EDIT:

I dont know how its works but... On Reverb G2 I was playing with 0,8 quality in WMR toolkit and i get about 60 FPS. In this case rerolution = 2160*2160*0.8 = 3732480 pixels per eye.

With Pimax i have 2560*1440*1.2 = 4423680 pixels per eye and i get about 65-72 FPS. How it is possible?

I think 110hz with smart smoothing is a good idea, I remember experimenting with this on my 8k+ and found out that the higher your frequency, the less ghosting you see with smart smoothing switched on.  Try it out, it might be good.  55 FPS is much easier to sustain.

For your second question you need to first consider the selected FOV on Pimax.  If you are at standard FOV, you diag FOV drops from 200 to 170 degrees if I remember correctly. As a result, you do not use 100% of the pixels and thus your effective resolution is less than 2.5k.  I would argue that your effective resolution has probably a pixel count similar to the G2.  Secondly is the rendering pipeline and specifically the software part of it.  It could be that the Pimax pipeline is more effective that the G2 pipeline.  It could also be that settings were not the same between the two HMDs.  For instance, if you use FFR with the Pimax, it is a big FPS booster.

[goliat26]

On 6/2/2023 at 7:49 AM, WipeUout said:

I think 110hz with smart smoothing is a good idea, I remember experimenting with this on my 8k+ and found out that the higher your frequency, the less ghosting you see with smart smoothing switched on.  Try it out, it might be good.  55 FPS is much easier to sustain.

Yesterday i change 1.25 in Pimax settings to 1.2 PD in DCS and turn on FFR Balanced (in Pimax settings) and i have more stable 72 FPS. With FFR on Balanced profile i cant see worse graphics so lower resolution must be way far from center. I will test 110Hz with Smart Smoothing to and i report results :D.

 

And back to IPD. I measured my ipd exactly and its is about 55-56mm so now its clear why Pimax IPD is too big for me. IPD mod is only way for me:(.

Edited June 3, 2023 by goliat26

[WipeUout]

10 minutes ago, goliat26 said:

FFR Balanced (in Pimax settings)

Note that FFR (Pimax) does not work if your runtime is OpenXR.  When using OpenXR, you must use FFR within OpenXRToolkit intstead of FFR with pimax client or pitool.

[goliat26]

On 6/4/2023 at 3:23 PM, WipeUout said:

Note that FFR (Pimax) does not work if your runtime is OpenXR.  When using OpenXR, you must use FFR within OpenXRToolkit intstead of FFR with pimax client or pitool.

Ooo good to know . That is the reason why i cant see worse quality ring :D.

Now i have another problem/question. I ordered and got my first base station. This is Valve Base Station 2.0. Tracking is enabled but i all the time isee little jitter/image jumping. Image jump 1cm right, 1cm left etc... I read that a lot of players have this problem, is any good way to fix it?

[WipeUout]

I use a lighthouse 1.0, no idea about this issue sorry.

[WipeUout]

Some additional findings:

Combination of PimaxXR 0.3.4 with Pimax client 1.11 offers the smoothest ride.

Client 1.12 and 1.13 are not performing as fast as 1.11 and cause in some cases a 0.5ms increase in GPU frametime.

If your sim with your HMD refresh rate at 90hz, then PimaxXR 0.4.0 causes some sporadic stutters.  Reverting back to PimaxXR 0.3.4 solves the issue combined with Pimax client 1.11

Pimax client is hard to find, here is the link:

https://drive.google.com/file/d/1uj9v26nPSkSe2Og4JPMIzxNIgOnlcFCl/view?pli=1