I nearly never use created terrains, but plannig to use a heightmap based system to fine tune performance by setting terrain mesh resolution, so if you can make a simple example for Jcl he might help. he resolved when we reported the missing auto hull updating functionality.

currently only normals are not set automatically after vertex movements, but I think the engine default terrain vertex normal calculation is wrong, as my c-trace based solution looks very differently, and much better (except at some very sharp position which cannot be found in case of a real terrain).