Shadows and light too sharp after scene rebuild

[anonymous_user_c3da3a31]

@.

The problem is probably with lightmap resolution. Because objects are static, their lightning can be prebuild. The resolution of lightmap, however, is probably too low, or the lightmaps are not properly set. Try increasing the resolution of lightmaps on your objects and rebuild (Lightmap resolution on your mesh). If you use non-uniform scaling, you will also also get lightning artefacts so try to avoid it on static meshes.

How large is the mesh and what do the light map UVs look like?
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The model has some 10,000 vertices. And below is the light map UV (I think? Light map UV maps are vaguely documented, but as far I undestand it UV channel 1 is the light map UV). I highlighted the main building mesh in red so you have a chance to see what you’re looking at. The walls and the cieling, that is.

What puzzles me and what’s very confusing is that the light looks fine before I hit build (see first picture in my original post above). So, Unreal is obviously capable of generating proper lighting on the mesh. I mean, it’s there. I can see it! Why oh why can’t the light stay exactly like that after I build the scene?!