I'm currently studying how to create fast and detailed terrains using procedural textures in C4D+Octane. This render took about 30 seconds. More to come...
Substance Desiger Materials
These are basic material samples from Uncharted 3: Drake's Deception. Hand sculpted in ZBrush and painted in Photoshop. See more on my site here: http://bradfolio.com/portfolio/naughty-dog/uncharted-3-drakes-deception/
Concrete Rubble Tiling Texture, Kyle Bromley on ArtStation at https://www.artstation.com/artwork/concrete-rubble-tiled-texture