You can see a before version here, further back in the thread.
Memory isn’t perfect from more than a year ago, but, hey, I found screen shots from while I was working! I think maybe I created a series of planes going back from the boundary where I wanted to taper the wave amplitude to zero, and intersected them with the volume to make vertices within the surface, and then scaled the boundary vertically to zero with some radius of influence, if that makes any sense.
