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Lightmap Discontinuities

I have spent about a week cleaning up this model and also layouted its lightmaps by hand to get the best possible result. However, after building lighting in production quality, out comes this:

6084e96307682231706d1fc14181c41984e6b699.jpeg

And here are the lightmap UVs I created for the castle and for the floor visible in the above screenshot

ue4-lightmaps-castle.png
ue4-lightmaps-ground.png

I have different charts (islands? chunks?) for the sides of the bridge and for its top to prevent shadow smear across hard edges. But somehow there’s a large patch of light on the bridge and a large patch of shadow on the ground that do not belong there.

What could be the problem here?

Your lightmap islands seem to be very close to each other. Do you get any messages about overlapping lightmap uvs upon light build completion?

None.

Do notice that the problems happen in the corner of the bridge (which has quite a bit of space to any neighbors) and especially on the floor which is a completely different lightmap with one continuous UV set for the ground.

What resolution are the light maps and how large are the meshes?

Your lightmap resolution is too low, if you see edges of the shadows that are blobby then that means it’s too low, default is too low for most things so if you didn’t change it then that’s why