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DEM terrain from WorldMachine

I guess I should ask this on the WM forums, but they seem kind of dead lately, so my apologies.

I have some coastal DEM data where zero point is at the ocean surface, meaning it doesn’t look very nice once in UE because my ocean ends up 10cm deep. I have managed to drop the surface, but end up with vertical cliffs around the entire coast, does anyone know how to make this gradual somehow? I tried to blur and erode but can’t seem to combine the channels properly. It would be great to do it in UE, but the smooth tool can’t be set to not affect points over a certain height so it ruins the important above water portion of the shore :frowning: