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This Particle Flow operator creates particles based on the fluid parameters. The birth probability is a function of the fluid parameters and is determined by the corresponding diagramsIt reads grid channels from the loaded data in a Phoenix Simulator and creates and places the particles in certain places of the Phoenix grid. Note that this operator not only creates particles, but also sets their positions. You could place another operator after it if you want to override the birth positions, e.g. Position Icon.

For each grid channel, a curve is used to determine the probability of particle being born. This way you can create particles where a grid channel has high values, low values, or if your diagram is flat, particles will be born equally throughout the grid. You can see the usual ranged for the different grid channels here.

You can improve the viewport performance of this operator by increasing the PFlow Cached Frame Count option in the Phoenix FD Global Preferences, However, this will increase the memory usage.

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