Another good thing about my concept is, that it can easily be used in animations, where a figure enters the bathtub or gets out of the bathtub or moves up or down in any way. The foam shader will automatically adjust appearence of foam to where skin is above the water, and suppress the foam and specularity of the skin, where skin dips under the water surface. In real life, when you stand up in a foamy bathtub, this is what happens, your skin collects foam from the water surface, so you are covered with foam again (given enough foam quantity).

Poser Pro 2014 GameDev, Lightwave 11.6.3, Blacksmith3D Pro 6, Bryce 7, Carrara Pro 8.5, Reality 4 & LuxRender, Python 2.7 & Wx-Python, UV-Mapper Pro, XFrog 3.5, Paintshop Pro X7, Apophysis 7x64

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Don't render faster than your artistic guardian angel can fly...