Best way to create and Populate 100km Square Island?

Development Rendering
3
  1. use the world browser ?v=fUx8vLosDLY
  2. I personally would also use the foliage tool to place all the vegetation stuff
  3. when you create the landscape in world machine/terresculptor you could also create layer weights (so that the terrain is already painted)
  4. all other stuff that is important for such big maps -> culling, lods