Thanks! I’ll take a look when I get time at the end of this week or early next week. Lots of stuff happening this week! (4.15 previews just started, Preparation for my training stream on lighting next week, documentation work, etc)
That’s sad to hear, I was holding out hope that it might still be possible in Lightmass since it’s baked and non-dynamic.
It’s still possible to use lightmass, just I think the best course here is to not use it on the billboard by disabling shadow casting for that part of the mesh. Any baked shadow for the LODs before the billboard should still be baked. That should work, in theory. I just need to see the setup and work it out.