HDRP and 4K display issue when enabling XRSettings

Hello,

I'm using Unity 2019.1.1 with HDRP 5.16.

Objective: enabling and disabling VR in runtime and mirroring on a 4K display.

Problem:
When I enable VR using

Code (CSharp):

1. XRSettings.enabled = true;

in code, it renders a black screen in the HMD or in the display when in using a 4K resolution in the Game tab.

Comment:

• When using a 2K resolution, VR works correctly.
• When using a 4K resolution and starting directly in VR, it renders correctly but when disable/enable XRSettings, it doen't work anymore.

Test Devices:
Windows MR Sansung Odessey
HTC Vive

Here is the code:

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using UnityEngine.XR;
6.  
7. public class Setting : MonoBehaviour
8. {
9.     // Start is called before the first frame update
10.     void Start()
11.     {
12.         DisableVR();
13.     }
14.     // Update is called once per frame
15.     void Update()
16.     {
17.         if(Input.GetKeyDown(KeyCode.V))
18.         {
19.             EnableVR();
20.         }
21.         if (Input.GetKeyDown(KeyCode.C))
22.         {
23.             DisableVR();
24.         }
25.     }
26.     IEnumerator LoadDevice(string newDevice, bool enable)
27.     {
28.         XRSettings.LoadDeviceByName(newDevice);
29.         yield return null;
30.         XRSettings.enabled = enable;
31.     }
32.     void EnableVR()
33.     {
34.         StartCoroutine(LoadDevice("openvr", true));
35.     }
36.     void DisableVR()
37.     {
38.         StartCoroutine(LoadDevice("", false));
39.     }
40. }
41.  

Does anyone know what to do to enable VR in runtime and mirroring on a 4K display ?
Thank you.

 

Thank you for the reply.
I found the solution :
I had to set eyeTextureResolutionScale after a yield return null; otherwise it doesn't work.

Code (CSharp):

1.  
2. IEnumerator LoadDevice(string newDevice, bool enable)
3.         {
4.             XRSettings.LoadDeviceByName(newDevice);
5.             yield return null;
6.             XRSettings.enabled = enable;
7.             yield return null;
8.             XRSettings.eyeTextureResolutionScale = 1.5f;
9.         }
10.  

Is this the official way to do it ?

I don't understand why it works when starting directly in VR with 4K resolution.

Should I file a bug ticket ?

 

I have submitted a bug report, case 1162760.
Hope this help.