Hey Dave... I really need your help in finishing up my build in babylonjs terrain system. I think i may need some mods to the CreateGroundFromHeightmap or maybe help in creating a new CreateGroundFromUnityHeightmap where we go in and compensate for the height map coming from unity and 'post' process those height values to make it look good in babylon. Please take a look at the the video link explaining the problem (Also is attached a TestTerrain.png height map at 100 width/length and 50 height for to try to get to make look good with a creategroundfromheightmap call):
Dear Dave - Please Help
Try This Playground and see if can't get not so choppy around the edges:
http://www.babylonjs-playground.com/#RDPE6#1