Fluid Force operator

The Fluid Force operator allows you to apply forces from (Phoenix FD) fluid grids to particles.


Fluid Node

  • Fluid input object: the grid object that forces will be loaded from.

Grid

Each particle velocity has a direction and a magnitude. Normally these values are processed as a single vector, but the Fluid Force operator gives you individual controls for both, which allow you to exert fine control over how fluid grids will affect particles.

Velocity Magnitude

These controls affect the overall magnitude of fluid forces applied to particle velocities.

  • Add/Blend/Replace: controls how forces computed by the operator will affect existing particle velocities.

  • Influence %: controls how much influence fluid forces will have on particle velocities.

  • Variation %: the per-particle percentage of variation to apply.
Velocity Direction

These controls affect the overall direction of fluid forces applied to particle velocities.

  • Add/Blend/Replace: controls how forces computed by the operator will affect existing particle velocities.

  • Influence %: controls how much influence fluid forces will have on particle velocities.

  • Variation %: the per-particle percentage of variation to apply.
Influence
  • X/Y/Z: controls which axis the forces will affect.

  • Relative to mass: controls whether particle forces will be relative to particle masses.

  • Simulate substeps: forces will be interpolated in a way that simulates the addition of forces at smaller simulation substeps.

Uniqueness

  • Seed: the seed value for all varied parameters.

Particles

PhoenixFD liquid grids may also contain particle data. These controls allow you to drive the corresponding particles birthed from a Birth Fluid operator, using the same grid.

Input Particle Channels
  • Channels: the various PhoenixFD particle channels which may be available in the grid.
Input Particle Properties
  • Position/Velocity: controls which properties to copy from PhoenixFD particles onto the corresponding particles within the event.
Settings
  • Delete if dead: if a particle from the event has no corresponding particle in the fluid grid for the selected input channels, it will be deleted.