HDRP | Fade to Black in VR

Hi,

does anyone know a workaround for using SteamVR_Fade script (from the SteamVR Unity Asset) in a HDRP project? The idea is when you teleport near a wall and collide with it not to see through the wall but instead fade to black
like this:

It works in Built-in Render Pipeline, but due to a change in the rendering flow it no longer works. There is an open issue in GitHub from last year: https://github.com/ValveSoftware/steamvr_unity_plugin/issues/388

Thanks!

 

Yesterday I've tried to implement a ScreenFader myself with the URP via Blit and a simple shader.
From the URP examples (Post-Outline) i tried to copy all that is needed. It worked in the example project but not in my own XR enabled project. I guess something is not right as i got an out-of-bounds error when i tried to look at it via frame-debugger(somewhere in the #if XR enabled region).
Then i tried to hijack the vignette postFX since i would never use it... but after a unity restart it was gone. Seems it gets overwritten when loading Unity.
Finally...
i just use the Color-Adjustments PostEffect to fade to black...

Code (CSharp):

1.  
2. public Volume ppGlobalVolume; // Ref to the PostProcessing Volume
3.  
4. Awake()
5. {
6.             if(!ppGlobalVolume.profile.TryGet<ColorAdjustments>(out colorAdjustments))
7.             {
8.                 Debug.LogWarning("No coloradjustments found!");
9.             }
10.             else
11.                 cp = colorAdjustments.colorFilter;
12. }
13.  
14. public IEnumerator FadeScreen(Color from, Color to, float timing)
15.         {
16.             cp.value = from;
17.             elapsedTime = 0;
18.             while (elapsedTime < timing)
19.             {
20.                 cp.Interp(from, to, elapsedTime / timing);
21.                 elapsedTime += Time.deltaTime;
22.                 yield return wait4Frame;
23.             }
24.             cp.value = to;
25.             yield return wait4Frame;
26.         }
27.  

And use it like this in a coroutine:

Code (CSharp):

1.  
2. yield return StartCoroutine( FadeScreen(Color.white, Color.black * -5, 2) );
3.  

I use Color.black * -5 to make sure it gets very dark, because if you have something emissive it would still be visible if you go to a "normal" black.

I hope that helps you.

 

Just wanted to say thank you. Very helpful.

I'll contribute my own full version of the script:

Code (CSharp):

1. using System.Collections;
2. using UnityEngine;
3. using UnityEngine.Rendering;
4. using UnityEngine.Rendering.Universal;
5. //using Sirenix.OdinInspector;
6.  
7. public class URPScreenFade : MonoBehaviour
8. {
9.     public Volume ppGlobalVolume; // Ref to the PostProcessing Volume
10.     private ColorParameter cp = null;
11.  
12.     private IEnumerator coroutine;
13.  
14.     enum FadingDirection {FadeIn, FadeOut}
15.     void Awake()
16.     {
17.                 ColorAdjustments colorAdjustments = null;
18.                 if(!ppGlobalVolume.profile.TryGet<ColorAdjustments>(out colorAdjustments))
19.                 {
20.                     Debug.LogWarning("No color adjustments found!");
21.                 }
22.                 else
23.                     cp = colorAdjustments.colorFilter;
24.     }
25.     IEnumerator FadeScreen(Color from, Color to, float timing)
26.         {
27.             cp.value = from;
28.             float elapsedTime = 0;
29.             while (elapsedTime < timing)
30.             {
31.                 cp.Interp(from, to, elapsedTime / timing);
32.                 elapsedTime += Time.deltaTime;
33.                 yield return new WaitForEndOfFrame();
34.             }
35.             cp.value = to;
36.             yield return new WaitForEndOfFrame();
37.         }
38.  
39.         //[Button]
40.         public void SceneFadeOut(float timeSecs = 2f){
41.             DoFade(FadingDirection.FadeOut, timeSecs);
42.         }
43.         //[Button]
44.         public void SceneFadeIn(float timeSecs = 2f){
45.             DoFade(FadingDirection.FadeIn, timeSecs);
46.         }
47.  
48.         private void DoFade(FadingDirection fadingDir, float timeSecs){
49.  
50.             Color fromColor = Color.white;
51.             Color toColor = Color.black * -5; // -5 ensures full darkness
52.  
53.             if(fadingDir == FadingDirection.FadeIn){
54.                 fromColor = Color.black * -5; // -5 ensures full darkness
55.                 toColor = Color.white;
56.             }
57.  
58.             // interrupt started fade and grab current value
59.             if (coroutine != null){
60.                 StopCoroutine(coroutine);
61.                 fromColor = cp.value;
62.             }
63.             coroutine = FadeScreen(fromColor, toColor, timeSecs) ;
64.             StartCoroutine( coroutine );
65.         }
66. }
67.