**EDIT: I can confirm that if I add in a landscape, it will break the distance to surface. I have a scene with it working fine, around a cube, then when I add a landscape actor, the effect breaks. I’ve tried moving the water plane far away from the landscape, and it’s still broken. If I view the global distance field, it’s broken when the landscape is set to visible.
It could just be an issue with my machine because for some reason, landscapes always seems to break the global distance field for me. Try testing this out on your end **@KarelOtruba
Open the plane static mesh, search for distance field, check generate distance field, save. It’s off, by default, on the default plane mesh that comes with the editor.