Question How to set refresh rate with OpenXR

When using the oculus framework (with OVRManager etc.) it is well documented how to set the framerate of the quest from the default 72Hz to the higher levels (like 90Hz or even 120Hz).


How can the same be set when using OpenXR (with the oculus plugin for OpenXR)?

We only found a way to get the refresh rate, but not to set it.

 

I am using the Oculus XR Plugin for this script, not the OpenXR Plugin. However, it sounds like it might help you?

(Lifted and modified from this previous post)
https://forum.unity.com/threads/90hz-for-quest-2.1006934/

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using System.Linq;
5. using UnityEngine;
6. using Unity.XR.Oculus;
7.  
8. public class RefRate : MonoBehaviour {
9.     void Start() {
10.         if (Performance.TryGetDisplayRefreshRate(out float rate)) {
11.             Debug.Log("Current refresh rate " + rate);
12.             float newRate = 72f;
13.             string debugout = "";
14.             if (Performance.TryGetAvailableDisplayRefreshRates(out float[] rates)) {
15.                 for (int i = 0; i < rates.Length; i++) {
16.                     if (i != 0) {
17.                         debugout = debugout + ", ";
18.                     }
19.                     debugout = debugout + rates[i];
20.                 }
21.                 Debug.Log("Available rates " + debugout);
22.                 newRate = rates.Max();
23.             }
24.             if (rate < newRate) {
25.                 if (Performance.TrySetDisplayRefreshRate(newRate)) {
26.                     Debug.Log("Setting new refresh rate to " + newRate);
27.                     // Time.fixedDeltaTime = 1f / newRate;
28.                     // Time.maximumDeltaTime = 1f / newRate;
29.                 }
30.             }
31.         }
32.     }
33. }
34.  

 

Hey guys, any news on this? We're currently relying on OVRManager from Oculus Integration to set refresh rate of display but would like to move to something more generic

 

Is this still the case? Or it is possible now?

 

Is this still the case? This is crazy. Using a current Oculus integration package together with OpenXR breaks controllers for me. We've spent days trying to find a solution for this issue and are now in trouble because we can't update our game that is in the store.

 

I'm also having this issue. We have a momentary lag spike at the beginning of our game that's causing the OpenXR refresh rate to tank. Is there a way to reset the target refresh rate post throttling?

found this post but haven't been able to set refresh rate with OpenXR

Performance.TrySetDisplayRefreshRate((float)refreshRate);

throws error:
DllNotFoundException: Unable to load DLL 'OculusXRPlugin'. Tried the load the following dynamic libraries: Unable to load dynamic library 'OculusXRPlugin' because of 'Failed to open the requested dynamic library (0x06000000) dlerror() = dlopen failed: library "OculusXRPlugin" not found
10-25 21:42:30.546 21458 21478 E Unity : at Unity.XR.Oculus.NativeMethods+Internal.SetDisplayFrequency (System.Single refreshRate) [0x00000] in <00000000000000000000000000000000>:0
10-25 21:42:30.546 21458 21478 E Unity : at Unity.XR.Oculus.NativeMethods.SetDisplayFrequency (System.Single refreshRate) [0x00000] in <00000000000000000000000000000000>:0
10-25 21:42:30.546 21458 21478 E Unity : at Unity.XR.Oculus.Performance.TrySetDisplayRefreshRate (System.Single refreshRate) [0x00000] in <00000000000000000000000000000000>:0
10-25 21:42:30.546 21458 21478 E Unity : at QuestGraphicsSettings.SetRefreshRate (RefreshRates refreshRate) [0x00000] in <00000000000000000000000000000000>:0
10-25 21:42:30.546 21458 21478 E Unity : at QuestGraphicsSettings.Start () [0x00000] in <00000000000000000000000000000000>:0

 

Performance.TrySetDisplayRefreshRate only works with the Oculus plugin, not OpenXR :/

 

Hmmm..... Is this still an issue? Not being able to generically set the Meta Quest 2 headset to 90 fps with OpenXR. I've been developing with OpenXR in my project for awhile because I want to deploy to both PC and Android devices. When I create a build, using a very simple scene, for both platforms, I noticed a complete difference in the speed of the players movement mechanic. When I profile the performance directly on the headset, I'm getting a steady 72 fps per second. But on PC the game can run at 90+ so the speed at which the player is moving feels much better. I'm trying to get the game to run at 90 fps per second on the headset, but Meta has changed all they're SDKs. So the Oculus Integration package is deprecated. I tried implementing the Meta XR Core SDK as I'm only interested in setting the headset to 90 fps, but when implemented, it breaks all the controller controls implemented via OpenXR Version 1.9.1. I'm not sure if this is the same problem @cubaschi mentioned, but its definitely similar. Does meta have a compatible SDK that can work with OpenXR? I'm still searching for a way to set the FPS on the headset that won't break my current controls. My hope is that by increasing the FPS on the headset, the speed of the player movement won't feel sluggish. Again, I've already profiled the app and I'm getting a steady 72 fps but it still feels sluggish as compared to the PC. Any help would be greatly appreciated.

 

Man I need this ability so bad. Right now I'm stuck. Because if I use the Oculus Plugin, I can set FFR, and Refresh rate, but I can't manage passthrough with the AR Camera Manager.

So, I'm using OpenXR so I can use the AR Camera Manager, but then I can't set FFR or Refresh Rate.

EDIT: Just double checked the Meta Quest OpenXR Feature Groups, and there is a feature group called Meta Quest: Display Utilities. Documentation shows there is the ability to set the refresh rate.

https://docs.unity3d.com/Packages/c...xr@1.0/manual/features/display-utilities.html

EDIT: I did just test this. And it works. But rather than the 72, 90, and 120 options you'd expect from the Oculus Plugin, the options it gives you with OpenXR is 72, 80, and 90.

 

mrphilipjoel First of all thank you for this discovery! What version of Unity are you using? In Unity 2022.3.0 I tried copying the code from the link you provided but maybe they changed the features from the documentation. For example, the if (displaySubsystem.TryGetSupportedDisplayRefreshRates( Allocator.Temp, out var refreshRates)) changed to if (displaySubsystem.TryGetDisplayRefreshRate(out var refreshRates)) and the displaySubsystem.TryRequestDisplayRefreshRate(refreshRates[0]) does not exist anymore. I also need this ability very bad

 

I'm using unity 2021.3.34f1. But, I don't think that matters. You would need to make sure you have the com.unity.xr.meta-openxr package installed.
I'm using version 0.1.2 in my project.

 

Unfortunately this call doesnt work anymore since the last Oculus Update as it seems (pure speculation)...
It definitely worked a few weeks ago, but now the application won't set refreshrate of the device and stuck at 72 hz.

Instead calling the method of the XRDisplaySubsystem.TryGetSupportedDisplayRefreshRates(..) will throw an UNKOWN Error.


Calling displaySubsystem.running results in false.

So somehow the Subsystem isn't starting anymore but I have no idea why.
Nothing changed in the project settings and the package is toggled on:




Calling displaySubsystem.Start(); does not start the subsystem.

Any idea what might be wrong here?