Passthrough and post processing

I'm facing the same problem, using same setup(unity version, plugin version, etc). The background is just black if the post-processing on the camera component is turned on. Doesn't matter if there's a global post-processing volume or not. 

Currently I'm just turning off the post processing on the camera when using passthrough, but I would really like to have bloom in passthrough environment.

Same here... Would be great to use both in combination.

Same problem, Integration SDK v 54.1. No one's got a solution ?

I had this problem a while ago, back then it was caused by the post-processing shader not reading the alpha from the framebuffer texture you had generated while rendering your frame. It put an alpha of 1 for every pixel, which means the passthrough texture (at least in Underlay mode) won't blend with the texture output from post-processing.

A hack that worked back then was to go to your UberPost.shader, and on line 238, instead of:

return half4(color, 1.0);

Use the alpha from the source texture, like this:

return half4(color, _SourceTexture.a);

This is mostly from memory, not sure if it still works! Also it will have issues with blending because now you have kind of a 'cutout' where the stuff you've rendered is drawn, you won't get effects in areas where you hadn't rendered anything before the post-processing was done. _Also_, this is a change to the URP package so you'll need to make your own branch of URP, either in your /Packages directory, or by some other cunning hack.

Good luck!

Thanks! I have checked the UberPost.shader in the package, and only used by the default PostProcessData.asset which is unable to be deleted. I have changed the post-process data to my custom post-process data which has changed the shader also. But the post-processing still does not work with passthrough‌‌.
I am using Unity 2022.3.14 with URP version 14.0.9 and 2022.3.14 Unity

This worked for me using Unity 2022.3.19f1 and URP com.unity.render-pipelines.universal@14.0.10:
Copy the com.unity.render-pipelines.universal@14.0.10 folder from \Library\PackageCache to \Packages.

In UberPost.shader, change (on row 287):

return half4(color, 1.0);

To:

half alpha = SAMPLE_TEXTURE2D_X(_BlitTexture, sampler_LinearClamp, uvDistorted).w;
return half4(color, alpha);

Adding post-processing tick on only the center camera in a OVR Camera rig. Make sure Universal Render Data file has Post-processing and HDR enabled. Add a global volume with bloom with some good settings. Now all HDR material with enough emission will bloom just fine. Not the most performant solution though. (The classic DOOM Volumetric Bloom trick is more performant)

But are probably better solutions in the thread, so you don't have to copy the entire URP package, but havn't tried 😄

Example: https://x.com/jonassandstedt/status/1765683987408711904?s=20

I'm desperately trying to get some bloom on top of passthrough but unfortunately your solution didn't work for me.
(unity 2022.3.20f1)

Update : I fixed it (bloom on top of pass-through) by going trough all the places where HDR is mentioned and manually set it to explicit OFF. it seems when i set the tick box for post process, it automatically reactivates the HDR for the camera even if the camera's settings is set to follow URP settings and URP settings are HDR off.

In Unity I use Meta -> Tools -> Building Blocks -> Passthrougth template. I do not know what is global volume for you, but for me all works with this template.

Following this for further testing

Haven't tried it, but looks like this is possible in Unity 6: https://www.youtube.com/watch?v=G6p8E2GMi-E