Thanks for the info! Now i got the Visibility Tool working. But i’m still unable to make the hole the same size as my model is. It seems that UE4 makes landscape in predefined grid and thus you can’t have 90 degree angles. As you can see in picture below, the corner is always cut at some corner.
So i am unable to make 90 degree, 2m x 3m hole in square shape? If this is the case, then do you have any advice on how i should fill the gaps between lanscape and a house on ground level?
://i1292.photobucket/albums/b569/Nuutia/Unreal%20Engine%204/visibility_brush_size_zps3jnqanc3.png