Add Velocity Force Node apply or replace velocity by other velocity field to the Simulation Data.

Input / Simulation Data:
Input simulation data for Add Velocity Force. You must connect this input for work.

Input / velocity Grid:
Input velocity grid data for the force. You must connect this input for work.

Input / mask Grid:
Input SDF or Fog grid data for masking. The mask makes gradient effect between min Mask Falloff and max Mask Falloff.
Imported SDF Grid will be convert to Fog grid(surface = 0.0 / deepest = 1.0) and use that value for the gradient and effect.

Output / Simulation Data:
output result simulation data.

on/off:
Defines on/off status for this function.

Velocity Multiplier:
Defines multiplier to the input velocity.

Function Type:
Defines effect type of the force.
Add means add input velocity field value to the simulation velocity field. Replace means replace input velocity field with the simulation velocity field.

Invert Mask
Inverts the mask.

min Mask Falloff:
Start (or End) Falloff value. If the mask voxel value is smaller than this, full effect.

max Mask Falloff:
End (or Start) Falloff value. If the mask voxel value is larger than this, no effect.