Broken lightmap

[pointcache]

@jonimake;270085

I used to get similar problems in UDK. Deleting the lightmass swarm cache helped usually. You could try the same.
The cache can be found in:

%localappdata%\UnrealEngine\4.7\Saved\Swarm\SwarmCache

Thanks man that didnt fix it but its good to know,
now for you padding guys

this are lightmap uvs that UE produces himself, please file a report that UE4 does not use padding and teach them how to do that properly.

I fixed the problem, and it is related to UE4 bug.