I might also suggest the use of the undo/redo tool in the terrain editor (a little like the "History Brush" in Photoshop): If you want some areas rough and others smooth e.g., use a function to produce the roughness, "Undo" this, and then paint the roughness back in the areas you want with the "Redo" tool (or vice-versa, smoothen the terrain, "Undo" and paint the smoothness back). You can also smoothen specific areas with the "Effects" tool, use "Diffuse Erosion".

• Lars "bigbraader"