This of course should have been in Terragen years ago. It's one on my list of wants that can be struck off. Plenty others though. Notice the beautiful structure of the voronoi ridges. That's great for canyon like mountain ranges because it creates much better valleys than perlin. That's one reason why I was using Blender for terrain. Then the cauliflower like voronoi billows. Very nice for rock surfaces. All we need now is a colour gradient so we can have beautiful multicoloured lichen like surfaces. That would be my next top of list of needs. Then curve graph. Better still, a curve graph and colour gradient like the awesome one in Modo.