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The Foam particles are rendered using the Phoenix Particle Shader in Point mode, which is the fastest particle render mode and is recommended for large scale scenes where individual bubbles are not visible and vast volumes of particles must be rendered. The settings are tuned in such a way that you can quickly switch to Bubble mode for the Foam and Splash mode for the Splash particles which are a bit more realistic but will take much longer to render. The Point Shadow Strength is boosted to 3.0 so the volume of the foam volume stands out and the foam is not rendered flat. The Point Alpha is lowered to 0.1 so individual foam particles don't pop up in the render as bright points, and only larger masses of foam are rendered more opaque. The The Volume Light Cache of the Particle Shader is also enabled and uses a high Light Cache Speedup in order to improve the render times.

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