Thats what I was talking about! ... Looking really good! The fact its add lightly submerged banks by flattening/smoothing as can be seen through the water is great. That adds a lot of flexibility. Would the "shapes" you mention be something hard-coded or can users add their own? While I'm on a roll ... Ideally you need something to create erosion ... that can be used around soft sand - like at beach, and also on hills and mountains, cliff edges etc... to create this sort of effect ... but even slightly (like a 10cm drop or so which is found around bays and river edges) so something that creates quite a sharp erosion effect, and ideally can be re-used to created eroded 'layers'