Thanks!
I’ve also been having a weird issue with certain meshes I’ve edited with MeshTool - Lightmass crashes when they’re anywhere in the map. Once I realised this was happening it was super hard to track it down. I don’t know if I can provide you with a repro case other than maybe sending you one of these broken meshes, so let me know if you want me to do that.
Here’s me talking about it on twitter:
Lightmass just silently fails at 0% - there is nothing useful in the log, it just acts like I force quit Lightmass through task manager or something. I was able to make one of the meshes stop causing it by setting its Lightmap Coordinate Index to 1; it was on 0. Maybe when you generate the lightmap UVs you aren’t setting the lightmap coordinate index correctly? That wouldn’t historically result in a failure though…
