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