Hello guys !
I am encountering a strange thing in my landscape. I’m learning UE for some weeks now and have wellll progressed, but didn’t spend a lot of time to landscape…
Would someone explain me why do I have those artefacts please :
It bothers me a bit 
Thank youuu
Hello Hdubs37,
Are these shadows from underneath the mesh leaking into your landscape? It looks as like that may be what is occurring. If that is the case, you may be able to increase the lightmap resolution to adjust it. Let me know how that works.
Thank you FrostyJas for your time !
All the light settings are set to default value, I didn’t change anything yet ( UE 5.1) , and just created a low poly landscape following this tuto :
It seems there is no artefact in the video. I will check the light settings as you tell me when I get home and let you know, thank you again.
Have a nice day.
@FrostyJas , could you tell me where to motify this setting please ?
note : when I am in the viewport, I also have those arteface, but if I do “build light only” they disapear. i don’t know if it helps … 
thank you