>>717608539
here's what I meant. Notice on the left, in Trenchbroom I have 2 brushes each one being a func_detail (right click on brush, Create Brush Entity > Func > detail). Then, when imported on Godot, those brushes are separated from the main mesh, as you can see on the right side. I use those as door slots, but you could do the same for the water, since being a separated mesh it could have it's own material with it's own shader. Hope this helped!