Difference between left and right eye render when using HDRP Volumetric Fog in VR

Unity Engine
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1

In the steam VR view where you can see the rendering of both eyes separately, it is clearly visible that there is a difference between the left and right eye render.

When we disable ‘volumetric fog’ in the HDRP volume, this difference is gone.

Is there a way to fix this?

6560365--743212--volumetric fog.PNG.jpg
6560365--743212--volumetric fog.PNG.jpg1470×798 97.3 KB

2

Can you clarify the issue ?
Or even better, log a ticket with repro steps ?

3

This is a reproducable scenario:

Setup:

  • Unity 2020.2.0b12
  • HDRP 10.2.0

A scene with two elements

  • Steam VR player object (contains the camera)
  • HDRP volume object with volumetric fog

two screenshots:

  • one with volumetric fog enabled (eyes are different, this is unwanted)
  • one with volumetric fog disabled (eyes are the same, this is what we want but with the volumetric fog enabled)

FOG ENABLED:

6560488--743221--volumetric fog_enabled.PNG
6560488--743221--volumetric fog_enabled.PNG1684×1279 191 KB

FOG DISABLED:
6560488--743218--volumetric fog_disabled.PNG
6560488--743218--volumetric fog_disabled.PNG1674×1271 175 KB

4

Is this with multipass or single-pass instancing ?
We’d still need a ticket + repro project to make sure this issue is prioritized properly.

5

single-pass instanced.

We will make the ticket asap.
could you send us the link for this?

6

Thanks!

7

https://fogbugz.unity3d.com/default.asp?1295399_3hjd87a2s9f0j29a

As stated in the bug report: we think we got it nailed down to a problem with HDRP 10.2.0 that is not there in 10.1.0

8

@fabien-unity When could we expect some feedback on that ticket?

9

Hi,

Thanks for the report, I was able to confirm and fix the issue.
It’s going to take some time until the fix is published in the next HDRP version (a few weeks or more).

Here’s a PR with the fix: https://github.com/Unity-Technologies/Graphics/pull/2823 if you want to apply it to a local copy of SRP.

Cheers,
Fabien

10

Thanks a lot for your feedback!
and the fix of course :slight_smile:

looking forward to that new version.

11

Thanks for the fix, I had the same problem in VR with HDRP using volumetric fog.

I updated my local file and it fixed the issue fine.

1 Like
12

Still having this issue, how can I resolve?