Here’s something Peter and me did in 24 hours with TerrainComposer and WorldComposer.
24 Hour Demo Tutorial document -> A pdf document about how we made the 24 hour demo.
It’s Mount Rainier in Washington extracted with WorldComposer and futher textured and vegetated with TerrainComposer. For the terrain rendering RTPv3 shader is used, and for the vegetation rendering AFS Advanced Foliage Shader is used
Have fun and it’s 900 square km. Check out the link as you can win prizes!