Progressive CPU lightmapper issues in 2018.4.3f1

Unity Engine
1

Hi,

We’re upgrading our game from Unity 5.6.2f1 to Unity 2018.4.3f1. This has required us to regenerate the lightmaps for all our scenes. Unfortunately, we’re having a problem using the “Progressive CPU” lightmapper. In Unity 5.6.2f1, we were able to create lightmaps with a size of 4096 in about 10 minutes for one of our smaller scenes. However, in Unity 2018.4.3f1, on the same scene, the lightmapper seemed to get stuck; the ETA kept climbing(eventually reaching 1200 hours) and the process didn’t end. We waited 24 hours for the process to finish. The only way we found to fix this problem was to reduce the lightmap size to 1024. The problem with this solution was that reducing the lightmap size to 1024 meant we had 6 times as many lightmaps for the same scene. We also tried disabling the “Prioritize View” option in the lightmapper, but that didn’t have any effect. Is this a known problem? Is there some other option we can change to fix this issue?

Thanks,
-Kevin

1 Like
2

I’m having a similar issue, at least, your descriptions is very similar to what I’m seeing.

3

It might be an upgrade issue of some sort. I would recommend creating a copy of the project somewhere, and deleting everything apart from Assets, Packages, and ProjectSetting folder. Re-open the project in 2018.4 and see if the issue reproduces.