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The simulation of the particles is very different for each type. The simplest one is the "drag". This type of particle simulation generates particles that are just dragged with the fluid. This is much like the PhoenixFDForce operator for the standard particle systems but much more efficient: you can drag a million particles in few minutes. The second type (by complexity) is the splashes type. The splashes are just left in free fall until they hit some object or the water surface. The free fall is not the simplest one, it is affected by the movement of the air (do not forget that Phoenix simulates the air too, not just the liquid!) and the air-splashes interaction is controlled by the air friction parameter. The most complicated type is foam. The foam particles interact not only with the fluid, but with each other as well. This interaction produces a repulsive force when the particles are too close, and an attractive force when they are not, ensuring the foam's consolidation. This process is the most expensive one and is controlled by the B2B interactionFoam Volume parameter. When only surface foam is needed, the aforementioned process can be switched off by setting the parameter to zero.

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