Nice try Diolma thats R=sqrt(u^2+v^2) but I am still unsure about the frequency of the sine wave 2pie or 360? Caution: I do not try to push the math nodes over the edge and have not crashed Poser 5 SR4.1 yet, but things like dividing by zero and taking the square root of a negative number have always been very bad. [untested] (I did get very close to the log of zero (also not recommended) and Poser seemed to handle that just fine) Thanks for the lighting tip nance. I will work that into my next set of renders. (The water will create moving shadows if a light is raytraced through it [tested]). Timesaver tip: don't raytrace (refract or reflect) until you are ready. just transparency will work for initial placement.