Baking fails consistently when scene includes a certain mesh

[Creepypie]

Hey, I'm having issues with a certain mesh. For some reason, in a specific scene, it fails baking consistently. This doesn't happen if I remove the scene (I bake a group of connected scenes together) or if I remove the object from that specific scene. The object exists in other scenes that are a part of the bake but it doesn't throw any errors for them.

I checked the console as the error suggested but found nothing relating to the error.

Mesh file: https://drive.google.com/file/d/1vCkxy8jojIp28XL7SM4P5xq2Tskw_g_f/view?usp=sharing The specific submesh used in the error is HandPlane_MDL, although I also had the error happen with other submeshes too.

I followed the instructions in the wiki for troubleshooting without success. If there's any other information you need I'll be happy to share. Thank you!

[guycalledfrank]

Sorry for the late reply. I tried baking this mesh and didn't see any problem:

"Can't fit" happens when the default atlas packer fails to fit all the requested objects in one atlas (in a reasonable amount of iterations), so I guess these objects are just the final drop. Are you using any Lightmap Groups on them? Did you try using xatlas as the atlas packer?

[Creepypie]

Hey, thanks for the reply.

Yes, they're in their own lightmap group, and I'm using xatlas for packing.

[guycalledfrank]

Since I can't reproduce it in an isolated scene, my suspicion is there there is something else in the scene, taking all atlases and not letting these objects to fit - most likely there are some objects with NaN/Infinity in their UVs, as that could possibly propagate to all other atlases. If you can send me any test package where it's reproducible, I'll debug and fix it.

[Creepypie]

Hey again, I couldn't reproduce this in an isolated project, weirdly enough. When I made a new project with the scenes in which I encountered the error, the bake completed successfully. It feels to me as if there's something going on with the source project itself (which I can't send because of NDA and >80gb of files lol), but I have no idea what to check. If you have any tips for steps I should take, I'll gladly do them.

[guycalledfrank]

The boring but reliable method is just to hide a half of your lightmappable objects and try. If it doesn't work, hide the half of the remaining objects... if it works, show the half of the previously hidden - until the problem-causing objects are found. The FBX in question is likely not related.