Do substance designer have an opacity or transluency map option? For foam

hegvbwkeuyrv

So i want to create a foam in a water. But the water is generated in unreal. So im thinking i can just make a plane an put substance material (foam) in that plane. Any tips on creating this effect? Im thinking of using some kinda of mask to remove the water part from the plane. 

Also, if i can make that mask, what option in unreal can i use in the shading network to utilize this mask as a opacity mask?

Skinner3D

Was actually wondering this myself, except for cloth. Found this after a brief search, haven't had a chance to try any of it though. https://steamcommunity.com/app/273390/discussions/0/618463446166172769/

hegvbwkeuyrv

for cloth isnt it easy just take the height map and modify it?