Bug URP - Lightmap disappearing

Hi all, not sure if it is a Unity bug that I am having or if it is exclusively to URP.

I keep baking lightmap, using the Progressive CPU, Mixed Lightings with Shadowmask.

The reflection probe keep losing the reference to the cubemapped texture (it gets gray), plus the baked lightmap is missing, even though it is set correctly to the scene in the Light Settings. It just ignores it.

I realized that when I load the scene during playmode, the scene loses it forever. Even when I get back to that scene in Editor.

I've used Progressive CPU lightbake since the first preview, never seen anything like this before, so I am assuming it is something with the new Unity version or URP.

I am using 2021.2.0a20 with URP 12.0.0

Thank you.

 

Having the exact same problem ever since around 0a12.

 

If anyone can get a reproducible project with the problem then send it as a bug, would be nice, hopefully get it looked at. Ideally using latest beta version for a better chance at getting it fixed.

 

Actually, that's the problem - ever since 0a12, I can't find a way to reproduce it. I'm already using beta release, and yet it is still happening. Not consistently though.

I wrote about it two months ago on Discord, just to see if there's anyone experiencing this as well.

 

I was able to make the bug in a default assets project, with the new Beta.

Still didn't get a pattern on how to cause the bug. But the exactly same thing happened. It had all the lightmaps set up, but cubemaps were gray and no lightmaps were seen in the scene.

Do you have multiple scenes being loaded?

 

I can confirm the same bug. All lightmaps baked (with the current version) are shown, but after several re-compile or re-start of the Editor, they aren't loaded neither in the Scene view, nor the Game view. My project didn't include any light probes. The Baker is GPU Progressive (which BTW it's now a lot faster than before).
Also, I can confirm that the player build include the lightmap textures (they are present on the buidl), but they aren't shown in-game.

EDIT: Also worth mentioning I'm using Shadowmask as Mixed Lighting

 

Get the same bug with 2021.2.0b3.3078.7
No render pipeline. Build target is Android.
Im constantly switching between scenes and sometimes after loading the lightmap is gone.

Edit:
maybe a hint: Git is telling me the LightingData.asset file of the scene was changed. Can't tell exactly what changed since the file is binary. Whats also strange is, that I can't discard the changes...

 

Mine seems to have been partially fixed. Might be a conflict with previous version. Did you guys update the engine in the middle of the project?

I went to every single scene, Deleted all lightmaps. Also the folders. Rebaked everything.

Lightmaps seems to be working, BUT, reflection probes still missing every other scene loading.

Solution was to set it as custom reflection and plug in the reflection that goes away manually. :/

 

I'm quite new to this open beta game. Is there a roadmap showing when b4 is going to be released?

 

Generally, they do weekly releases but sometimes they skip a release or two when it's too unstable. Otherwise there's no fix dates.

 

I can confirm that in b5, b6 and b7 the bug is solved.

 

I'm using 2021.2.0b6, and I'm still having this problem. Only seen it when sharing Lightning Settings file between two scenes.

 

@LeonhardP tried replicate this bug in a new project for 1h now. Sort of succeeded. But not sure if it's anything related. Have sent a bugreport with the same name as this thread.

 

Hi @LeonhardP

I'm having the same issues with Unity 2021.1.28f1 and 2021.3.15f1

In my instance, this happens with both Unity's progressive CPU light mapper and an asset store tool called Bakery.

I submitted the project here: CASE IN-29136