(Case 1183936) Android VR Postprocessing Bug Collection

So for everyone also trying this out, and to help Unity with the current process of manually testing everything for non-Editor-Desktop platforms, here's a list of stuff that is broken on Android VR with URP.

Baseline is Android + OpenGLES 3.1 + VR (basic setup for Quest). Additionally, VR support for Desktop is turned on to enable desktop testing while on Android build target (also basic setup for Quest).

From there on,
no postprocessing, no volumes: "works" (with all the known bugs, but at least you get two images with stereo separation)
Edit Mode: post fx work both in single pass + multi pass

Play Mode, post fx disabled on camera:
Multipass


PostFX disabled, Single Pass (note that this is the only working combination of all options)


Single Pass + "Render Post-Processing" on camera enabled, no Volumes, no "StopNaN"


Above + turning "StopNaN" on


Above, + turning FSAA on

 

Above + SMAA instead of FSAA


Toggling Postprocessing on the Camera with StopNaN enabled


Note that so far we didn't even have a Postprocessing Volume!

Now, on to that:
Enabling Depth of Field Bokeh while StopNaNs is on and no AA


Enabling Depth of Field Guassian while StopNaNs is on and no AA - note that there seems to be an additional Linear/Gamma issue but not sure


DepthOfField + Vignette


The same issues happen on-device.

The issues look a bit different:

• have a different number of splits
• some additional issues with left/right eye sometimes being swapped
• stereo offset being totally wrong
• shadows being flipped before being applied to the scene
• linear/gamma conversion issues with some combinations of the above

 

As to "Why would I want Post Effects on Android VR" as this is coming up again and again: we have a very clear usecase of presenting singular game assets in VR on Quest. This means, 1 model, already optimized for VR in a game setting, and with enough frame budget left to do PostFX.

With Depth of Field enabled, I actually see 60-72 fps on Quest with our setup and usecase. It's just unusable, but performance is ok.

To summarize - current state of PostFX in URP Mobile VR:


I hope this thread helps to get things fixed. Please note, LWPR/URP are officially out of preview and ready for production since April 16 (Unity 2019.1).

 

Thanks for the reply! Unfortunately Single Pass is basically the only option for mobile VR.
Also note that the first screenshot (left image, right black) is with Multiview, so that isn't really working either.

Curious, what do you mean with "on the way out"? This is broken both on the last couple release versions (at least since 6.9.0, I think longer) and on all newer versions including the current SRP master.

 

I was someone who was overly flippant and dismissive in another thread about this, but certainly there are cases where you can use post fx if you know what you're doing and it seems like you do.

The original argument was simply that using post fx means you are going to struggle to maintain your frame rate, and if you sometimes only hit 60fps that means you are missing your frame target by almost 3ms. I don't want to be a cheeky monkey so I won't point out what you might be using that probably takes about that long

But, seriously, if you can squeeze the margins enough to fit it in, that's fantastic, and hopefully it is actually working soon

 

@daves, just to make sue the team is aware of this: On current SRP 7.1.x release branch, all stereo modes are broken. Editor Windows Desktop, on Windows build target. I assume they're also broken in build.

• Multi Pass only renders left image, right is black
• Single Pass creates the funky octaview things seen at the top
• Single Pass Instanced breaks ShaderGraph shaders (work in scene view, broken in stereo with eyeIndex shader error).

 

@daves After seeing that there currently no Graphics Tests preventing this, I added some.

Pull Requests:
#4679 (for PostFX)
#4675 (for ShaderGraph, as that is currently broken as well)

Hope that helps.

 

I'm a bit stunned, but the situation with yesterday's release of URP 7.1.1 got even worse! Now all of the above and some more also happen on regular Desktop VR, with no properly functioning mode remaining.

Well, I guess that's my new record for bug-reports-per-minute:
1185839 [URP] Enabling GPU Instancing on ShaderGraph-based material breaks Single Pass stereo rendering
1185837 [URP] Single Pass Instanced VR rendering breaks ShaderGraph shaders
1185836 [URP] Gaussian mode in Depth of Field breaks Single Pass Instanced rendering in VR
1185834 [URP] Single pass stereo rendering is broken with post effects
1185832 [URP] Multi Pass rendering broken in VR with post effects

@daves @LeonhardP

 

@daves I'm sure you know, but just for the record, it's not just post processing effects that are broken because of this. Any shader that tries to use the Opaque Texture in LWRP is broken. So things like glass/water refraction are broken. This is a water refraction shader from the Lux LWRP shader pack in VR.

 

Is this also in URP? This is an exact issue I am having in URP also.

 

My bug reports about this usually bounce back as "by design since we didn't get to it yet", so I made a PR on the SRP repo with a test case for this:
https://github.com/Unity-Technologies/ScriptableRenderPipeline/pull/4803

 

My PRs have been merged in, but turns out they were just disabled again today since, well, they don't pass. Hooray!

I do hope that's temporary, as there has been work on fixing postfx;
here's the branch: https://github.com/Unity-Technologies/ScriptableRenderPipeline/tree/urp-xr-post-processing-fixes

 

I see this is from the Lux LWRP Essentials, is that pack effectively still broken due to these issues with reflections? Am mostly interested in using the water from that scene if it ever works but won't rush to buy the pack if it is broken for VR.

 

I haven't had a chance to test it with the latest LWRP (6.9.2), but the author of LWRP Essentials implemented a workaround that manually splits the eye texture in half. It works on PC, but is not 100% correct (I think the shader should get the eye texture before it gets warped for the correct effect, which doesn't appear to be possible). It doesn't work on Quest.

 

I wonder if the creator will fix that or just wait for the (hopefully inevitable) fixes for the Quest rendering to be done by the Unity Devs

 

i made it work using urp 7.1.2. using single pass instancing. but single pass and multi pass are broken.
custom shader graphs break as well..

 

Just for others that find your answer @larsbertram1 : Single Pass Instancing is not available on Android VR (Quest/Go), Single Pass is the only viable option there.

 

problems when it comes to vr are pretty much the same (except from pc supporting that instancing mode which actually works with image effects). but i think single pass and multipass should run on all platforms.

 

Hi, guys, how come that in the android build for Oculus Quest, my scene is a lot brighter and duller when i don't have any effect on my pp profile?

I have selected my camera to use post processing and in the volume i have put a profile in which there are no override effects. In the editor, the scene doesnt get brighter the same way. By the way, when I turn on my effect in Quest, it works fine.