"Flickering" baked reflection probes

Unity Engine
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1

Hi !

I have this strange issue with reflection probes. Depending on the angle of the camera, the probes is disabled.
I’ve played with many parameters but I can’t find where the issue is. This behaviour is global, every reflection probe have the problem, in any scene.
Anyone got an idea ? Thank you very much !

Using Unity 2020.3.22 with HDRP 10.7.0.

Here is a short video of it in action and the typical probe config I use.

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2

Something seems to be off with probe sorting. HDRP has its own reflection probe system. I will move this thread to their forum, maybe they’ll know.

3

… any news so far? I’m experiencing the same problem - it suddely showed up - and it’s very annoying and project ruining :frowning:

4

Thanks for moving the thread.
No news on my side sadly. I did some additionnal tests without good results.

5

Hey, it looks like a light culling problem.

It could be interesting for you to play with the custom frame settings in the Reflection Probe’s Inspector (or in the global HDRP Settings), and toggle the settings on and off for the Light Loop (“Compute Light Evaluation” for example).

https://docs.unity3d.com/Packages/com.unity.render-pipelines.high-definition@15.0/manual/Frame-Settings.html

If disabling some of these help, it could be a workaround, yet not necessarily optimal for performance.

Have you also tried to create a tiny repro project and upgrade it to a more recent version of Unity/hdrp? If so, can you reproduce the problem (for instance in 2021.3 or newer)?

6

Hi, thank you for your answer.

I’ve done some tests with the settings. Nothing seems to have an impact on my issue.
I will do a Unity+HDRP upgrade in the next few weeks. Can’t try it now, I’ve an important deadline that is too close to spend time on this for now :stuck_out_tongue:

I’ll post news on this thread later, once the upgrade is done.

7

[mention|YVIBsEH6MKHMot88lGvETg==] [mention|zCT8DHojJ4NiVTZ9/DvEow==] you had both mentioned this has been happening to you recently as well here .

might be worth looking into what @pierred_unity has mentioned see if you have any luck there.

The last time i saw anything like this happen was the terrain system back in 2019, I highly doubt it is related in this instance. frame debugging may also give some insights.

8

Hi !
I’m back with an update.
I’ve spent a good part of the last few days to do a FULL update of Unity and all my assets. Deleted all cache/library folders. Rebaked lights / occlusion / probes (using the built-in light renderer).
I’m now using Unity 2021.3.9f1 and HDRP 12.1.7.

The issue is still there :frowning:

9

Nobody got an idea of what it can be ?
I’ve made another project to test, didn’t had the issue. So I suppose it’s because of my config on the main project.
I tried to disable/enable every single frame setting / volume setting one by one to find out what’s happening. No success.
So I started to think that maybe it is a third party asset, but I don’t have assets affecting light / reflection.

10

Dumb question: are you sure the reflection probe is not turning off when you move? (i know is very dumb)
Can you show the volume? please

11

Thank you for taking the time to answer.

Probes are not turned off. Here is a short video where a probe is selected and in the middle of the view (shown in Scene tab here but the behaviour is the same in game / play mode).

For the volumes, here is the main one, used as default for the whole project and the scene specific one.

8441654--1118936--reflection_probe_bug_volumes.jpg
8441654--1118936--reflection_probe_bug_volumes.jpg1400×900 147 KB

12

sometimes I get flickering of objects that are moving in the camera view, if I delete a HDRP Decal projector and it messes with the settings…

uh just for kicks, can you try and switch the renderer to forward only, in project settings>quality>HDRP

8441744--1118957--Capture.PNG
8441744--1118957--Capture.PNG1204×693 71.2 KB

13

Thank you for your suggestion.
Did a try, no success. Also tried to disable decals. Same result.

14

Questions:

  • What method do you use to render grass?
  • Are there any warnings in the console? Such as not having enough space for probes?
15

Hi !

  • I use Nature Renderer with mesh grass. But note that the bug does not affect only the grass. It is the most obvious visually in my short videos but every objects and the terrain are also affected by the reflection flickering.
  • No error or warning about lights, probes or rendering issues.
16

Could make a copy of the project and test on a new version of HDRP. You should report a bug using the bug reporter, as I think we’ve come to the end of what’s possible on the forum to solve this.

17

Already did a full update to the latest LTS version of Unity & HDRP.
Yes I will bug report soon since it looks like we are running out of ideas :frowning:

18

For me, it looks like a problem with transparent textures on the terrain, i do not see that problem with the big rocks there and the trunk of the trees but it happens with the foliage (which have alpha) i think it happens with the terrain by the way is painted, or maybe the youtube’s compression xd, can you hide everything but the rocks, the trunks and everything that use textures without transparent or alpha channel and try it again? :slight_smile:

19

I confirm it is the same behaviour on everything :stuck_out_tongue:
The video does not make it obvious but the rocks are indeed affected. Also various smaller props, fences, buildings, houses, etc. Also have the problem in interiors with bunch of furnitures. Most of them use opaque textures.
But thank you for the idea :slight_smile:

20

bummer.
if you manually move objects around with the transform tool, does the object that you’re moving flicker while the remaining objects look normal?