Foliage is darker below certain height

Hello

Having a strange problem. The foliage below certain height is allways darker… It only happens on “movable” (dynamic lighting) Foliage. Anybody has an idea?

  • Skylight: Stationary

  • Sunlight: Stationary

  • Foliage: movable

  • I’m using “Loshuangs GPU Lightmass” (I know its setting skylight to static)

  • Terrain is created in Worldmachine and imported in UE4