The FractalLand3D application creates a landscape using a plasma fractal to generate height values for the landscape's component quads. The flatness/roughness of the terrain is controlled by a number entered at the command line which affects the fractal.
The quads are covered with textures, which vary depending on the the quad's average height. They are affected by lighting, and can be cast into a foggy gloom.
The user navigates with the usual FPS key controls, and automatically follows the lie of the land, moving up hills, and down into valleys.
This page contains two screenshots: one with the default flatness value, the other with increased roughness. No fog is present in these runs.