Many people have been having problems getting World Machine to export weight-blended masks from World Machine so they look good in Unreal Engine. Well, fret no more, as I give you the Height Mask Macro for World Machine.
This macro will take 1-8 height field inputs, filter them out from each other, and give you back perfect Unreal Engine masks! It will also give you a remainder mask, perfect for a base layer of grass or dirt!