Black aeras while using weightmaps from tiled landscapes

[anonymous_user_5cee3492]

Hi everyone,

I’m using World Machine Pro and Unreal Engine 4.8 to generate my landscape (I use tiled build and world composition)

So I have three layers used, Grass, Rock and Snow. I exported them from Comprehensive terrain generation like this :

Then for the base color for example I made this material :

But I get thos black areas that looks horrible

Any idea ?

Thanks in advance,
vinz243