I’ve got a weird behavior that I can’t make sense of. Little help?
So I made this generator (Substance Painter Shot):
Placed into my level, all is good WITHOUT a lightmap on the object:
As soon as I build lighting, the object turns dark, but some parts are still bright:
It gets even weirder when I place the object into the starter content map “Advanced Lighting”. With the lightmap built, parts of the object turn black…
…but strangely NOT on the sunlit side!
Here are my lightmap UVs. Not an ideal layout, but I can’t see anything that explains that behavior:
I also forced UE to generate a different UV layout by increasing the lightmap resolution, but nothing changed.
Lastly here’s my shader network for the material - it’s very simple:
I double-checked the face normals as well, couldn’t find a problem there.
Any help on this would be much appreciated!