This page provides information on the Phoenix FD Force operator for Particle Flow.

Overview


This Particle Flow operator affects the movement particles using the velocity from a Phoenix FD 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.

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.

UI Path

||Particle View window|| > Depot > PhoenixFD Force

||Particle View window|| > Event Display right click menu > New > Operator Event > PhoenixFD Force 


Parameters



Phoenix Simulator node – Which Simulator to read the Grid Velocity from.

Influence | influence – Determines how strong the fluid holds the particles. A value of 100% means that the particle will follow the fluid exactly. A value of less than 100% causes the particle's speed to only approach the fluid's speed. For example, a value of 10% means that at every integration step the velocity of the particle will overcome 10% of the difference between its velocity and fluid's velocity.

Ignore Time Scale | ignore_time_scale – When enabled, the Play speed parameter of the Simulator is not taken into consideration.

Affect Orientation | rotate – When enabled, the particle is rotated in correspondence to the fluid's motion.

Delete Particle Outside | delout – When enabled, particles which exit the Simulator's grid will be deleted. Note that the grid size of the loaded cache by the simulator will be used for this check and if there is no loaded cache, no particles will be deleted.

Time Source | timesrc – Same as the Offset Influence → Sync By parameter of the 3ds Max Force operator. It describes how to calculate the time argument passed in animatable parameters (in our case only the influence is affected). For example, if you set Time Source to Particle Age and you animate the Influence from 100.0 at frame 0, to 0.0 at frame 10, this means that newborn particles will initially be affected by the Phoenix Force with 100% Influence, and over 10 frames since the birth of the particle the Influence would decline until the fluid stops affecting the particle completely. This way no matter how early or late in the simulation a particle is born, the Influence would affect it depending on the time of its birth and not depending on the current timeline frame.

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