Nothing I have found can explain this to me. I have made a test map and mask. They are both just a river and empty space. They work perfectly fine via terrain, objects, etc. What I cannot figure out is adding water to the river. It goes through the middle of the map. I can upload pictures if needed. I have figured out that Ocean is the Ocean on the side. I have tried water material, trying Water.cg and Water for the material. Neither has worked so far. I added a small white patch that made my character swim if on flat ground on the white, but it shows up and does not add water. I cannot figure out how to make the river filled with water. Please help?