It seems there is a bug with Visibility Tool. I followed instructions and signed M_Ground_Moss from default package to be main material and then assigned a copy of it to be hole material. Now i’m lost on how to connect the Landscape Visibility Mask to it? Opacity Mask is greyed out. As i saw that to be the right place to connect it?
://i1292.photobucket/albums/b569/Nuutia/Unreal%20Engine%204/moss_visibility_zps20sifbop.jpg