Black spots in baked lights - Unity URP

[lament zenith]

Hey guys! I’ve been losing my mind since last night: basically, no matter how intense I crank up the lights, or how much I tweak the Light Probe Volume settings, the Reflection Probe Volume, or the Post Processing volume, these black spots always show up in the bake, even though the meshes are set up correctly.

I’ve already talked it through with the 3D modeler and one of my lighting artists, and it’s probably the floor meshes — which feels strange to me, since we use the exact same floors in other baked scenes and we’ve never had issues like this.

Thanks a lot for the help! ❤️

[gilded falcon]

https://docs.unity3d.com/Manual/GIVis.html
Examine the issue using lightmap UV overlap view and texel invalidity view
I would also open up the problematic model's like the door arch's mesh renderer component's baked lightmaps field to see where they are on the atlas and if some unexpected pattern can be seen there

[sage tree]

Overlapping uvs and accessable backfaces cause issues like this.
I forget if URP has the option to correct backface light interaction but having unity generate lightmap uvs is easy

[lament zenith]

ok, there are some invalid texels both on the ground and the door, while there's no ovelapping in the UVs. Also, there are there warnings on both the door and ground mesh renderer.

to fix this what am i supposed to do?

[sage tree]

the warning mentions overlapping uvs so what gives?
Anyway just enable lightmap uv generation on the meshes with problems in the import options and rebake light

[lament zenith]

yeah, that has fixed the ground tiles, thanks! i'm having some troublewith the door, and I'm running some tests with different lightmap resolutions for the door

[gilded falcon]

The doorframe shows z fighting, so you may have duplicate objects or duplicate mesh geometry
The door might have a similar issue
Texel invalidity occurs when a surface is exposed to a geometry backface
If that happens just barely around the edges where meshes overlap, that's correct behavior as those texels are supposed to be invalidated
But not meant to happen elsewhere

[lament zenith]

i actually had a black cube to "mask" the empty door frame, since the door size did not perfectly align with the door frame. I've removed but it still doesn't work