And if you're talking about natural water, I had to start looking at the Fresnel complications; the Fresnel angle controls where a body of water transitions from being clear & transparent under your feet, to reflective & solid-appearing toward the horizon. My guesstimates have been running about 10-13%, but the other variables under the transparency and reflection channels affect this, too (as well as the refraction index channel).

Message edited on: 02/16/2006 12:22