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Terrain Geometry Brush ?

Tried looking how to do this but failing miserably, anyone know how to do this ? …
https://www.youtube.com/watch?v=MlgvfEicdwU

Have you looked into https://docs.unrealengine.com/latest/INT/Engine/Foliage/index.html
https://docs.unrealengine.com/latest/INT/Engine/Actors/Brushes/index.html

I did have a look but not sure what I’m looking for. These work with the terrain ?

If your wondering the texture for the terrain is a landscape material you would have to set the different textures so you get the rock look when it becomes a slope, as for the tools the road is the spline tool https://docs.unrealengine.com/latest/INT/Engine/Landscape/Editing/Splines/index.html Hope that helps some what.