You can do 20 km x 20 km landscapes with 4096 x 4096 heightmap textures just fine. You just need to change the scale of the landscape. Though landscape will be lower res since the vertices are further apart from each other.
You can do 20 km x 20 km landscapes with 4096 x 4096 heightmap textures just fine. You just need to change the scale of the landscape. Though landscape will be lower res since the vertices are further apart from each other.