This is a fairly ingenious technique. I initially didn’t grasp the scale of the ‘export landscape to a mesh’ goal, but after some time I realized that you were intending on extracting a localized mash of just the area, merging it with geometry I was going to insert and the putting that back and probably nudging it forwards\up just a touch to prevent zfighting, when jiggle the sides of the landscape so the edges of the mesh are buried.
Cool idea! I was resigned to just making a ‘big mesh entrance’. I referred back to what funcom did in Conan exiles and that seems to be their go to approach.
Side topic, once you do a bit of work in UE4 playing a commercial game made with the same engine adds a new layer of enjoyment… you run along… for me, on a PVP server and oblivious to other player dangers… just stop and look at how they inserted cliffs n to the terrain structure give a little smile when the accidentally left jaggies on a ridge top. I’m sure I’m not the first to forget to play, or the jump up off the couch, logoff intent to jump on the the dev PC to try out something I saw 