Recent Koola's environment tests are pretty good. Not sure if he use the 2 new features of ue 4.6 and 4.7 preview which are :
really improved foliage instancing and
Precomputed lighting and shadows are now supported on foliage objects and instanced meshes! This allows for very efficient rendering in scenes with stationary or static lights.
He made a gorgeous winter forest scene too,
https://forums.unrealengine.com/showthread.php?58385-Koola-s-stuffOn a side note, I'm getting quite decent results with
auto-generate uv lightmaps tonight. I've decided to break my asset into multiple parts in 3ds max, save in fbx, import fbx...in Ue4, cranked lighting settings, high res lighmaps (512-2048), 100 indirect light bounces, etc. This test is with a 12k polygon design connected chair, divided into 8 pieces. As you can see no artifacts or weird shadows
This second test using the
auto-generate uv lightmaps, is a 67k triangle wall. lighting quality high for speed (instead of epic), lightmap only 1024! Ground is a brush.