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This Particle Flow operator affects the movement particles using the velocity from a Phoenix FD simulationPhoenix simulation.
It requires the simulator's cache to contain the grid Velocity channel.
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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When doing Liquid simulations, Phoenix FD populates the grid Velocity channel only for cells / voxels inside the liquid volume - empty (air) voxels contain no velocity information. To generate velocity information for the empty voxels, enable Simulate Air Effects under the Dynamics rollout of the simulator and re-run the simulation. |
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