That's NOT what I mean. Take a bird-bath. If all you have is an edge detection, then you would create ripples on the surface of the bath; ripples of some essentially random pattern. This plug-in I spoke of, would generate circular ripples that followed the shape of the circular container. If it was a square container, it would generate ripples off each wall, with the intersecting patterns as they hit. Very cool stuff. Of course this is mostly small bodies; a coastline deals more with wave patterns generated far offshore, that then change rapidly as they meet the bottom structure near the coast. They do not show those particular patterns caused by a wave pattern bouncing off a surface, intersecting other wave patterns, etc.