Yeah! That's the ticket -- or at least close enough for most images (for the real cool stuff we'll just have to wait for an actual fluid engine in Carrara....!) So what was the trick? I'm guessing, as I look to the smallish zone the effect is in and the geometrical (not physics-based) shape of it, that what you did was draw a complex multi-point curve in the fall-off graph. Basically, had it fall off as a series of nesting rings. Clever. I was thinking total surface and couldn't look past that to this more effective solution. Still...that is definitely ticket for more realistic water interaction. This goes top of my "will buy as soon as cash allows" list of plug-ins.