Ligthing error on seams

I have pretty weird ligthing Errors on my Stones, what can i do to correct them ? the error are on the UV-seams and additional i the Stones are sometime nearly white after light baking.

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Hi Hanabi,

This one comes up often. The UVs need to be welded together rather than split and laid out. The UV island on one side won’t know what the lighting information is for the next so you don’t get a nice bake.

This is covered in the lightmapping documentation here: Unwrapping UVs for Lightmaps | Unreal Engine Documentation

-Tim