Thanks rgkovach123 and Theodox!
I had textures at first, but even when plugging them in to a fractal network so their layout would be less predictable, tiling was still apparent from when zooming out. I went with 4 procedural textures instead, but when I tried to add another mask for road, it doesn't show up in render =/
Also plugged in a cloud texture for the bump map.
I'm still interested in sculpting details and painting realistic textures in mudbox and then split it up in(I dont know, 30-40) texture tiles. Is this something you do for feature film work? And what about rendering time?
The environment is 1x1 km.
If I split it up in 6x6 squares, i.e. 36 squares each square will be around 16 m. Would this be sufficient for like a 4096px texture?
I've been looking into script to populate my scene. What I've done til now is just created locators, positioned in xz(from top view) copied and repeated for the whole terrain. then selected all locators and ran xyShrinkWrap with the terrain. Then with a loop, duplicated and moved my plants to the selected locators.
I know I must use instancing, so I'll look into that next. I've heard good things about Carbon Scatter, so I might try that one.
In the mean time, here's my progress.