Shadows artifacts on asset

[StellarDrop]

Hello everyone! I’m here because i need your help. (No kidding. XD ) (sorry if my english isn’t perfect, i’m french… French are realy bad with foreign language)
I’m starting on UE4.
I have some artifacts on my imported assets (created with blender, see pictures)
I think the problem comes from lightmap. I try with custom lightmap and auto-computed lightmap by ue4.
But the problem persist. Please, help me X)
301762-
With bigger lightmap resolution:O

Casted shadows looks like weird too
I try with/without Lightmass importance volume… Same problem…

Thanks for the help!

[ClockworkOcean]

I think you’re partly getting a problem with that cylinder because it doesn’t have enough sides.

Strange shadows on the floor mean you need to increase the lightmap resolution of the floor mesh.

[StellarDrop]

Hello!
thanks you for your help. I found a temporary solution. I just turn “Lightmap Type”, to “Force volumetric”.

[StellarDrop]

Hello!
thanks you for your help. I found a temporary solution. I just turn “Lightmap Type”, to “Force volumetric”.