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some shadow problems about grass Foliage

Hi guys, here i have some questions.
I paint some grass meshes with Foliage,and some shadow probles appear after lightbuilding.
badafterbaking.jpg
If i don’t build any lighting ,the shadow seems good…so strainge,No building is better?
b4f13ea01aeb03bf2e0ca145bd612fd4de17b4ff.jpeg
Last I give up Foliage and begin use staticmesh and piace them in level manually,it is all right after baking
b87d40fd2bf0ec20da7e811371152221064ce4b7.jpeg
who can tell me what it is like this.Thx a lot!

Perhaps it’s realm time shadowing before you calculate shadows, that could explain why it would be ok ?

I had some probs with foliage too, Cascading Shadows on the directional light helped
https://answers.unrealengine.com/questions/64818/foliage-isnt-darker-in-the-shadows-of-landscape-or.html