---
title: "Force Field"
canonical: "https://documentation.chaos.com/space/PHX4MAYA/125862812/Force%20Field"
format: markdown
---
This page provides some details on the settings available for the Force Field (PhoenixFDField) object.

## **Overview**

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This field enables the involvement of **Maya particles** and other dynamic objects in the fluid's motion. It requires the simulation to be performed with **Velocity** output channel switched on. Note that you don't need this field for particles created by the simulator itself.

> Macro (ui-text-box)
> 
> When doing Liquid simulations, Phoenix 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](https://docs-chaos.atlassian.net/wiki/spaces/PHX4MAYA/pages/125637296) rollout of the Liquid Simulator and re-run the simulation.


 ** *****See Also:***** **  [Output Channels](https://docs-chaos.atlassian.net/wiki/spaces/PHX4MAYA/pages/126029700) | [Frame Index Transform](https://docs-chaos.atlassian.net/wiki/spaces/PHX4MAYA/pages/125995816)

> Macro (ui-text-box)
> 
> ||Phoenix FD menu|| **> Create > Force Field**

## **Attributes**

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![image](media://bce132bf-4cf2-4df8-a565-c2547338e688)


 **Simulator Node** | *simNode* –  The name of the Phoenix Simulator node as a string.

**Influence** | *influence* – Determines how strong the fluid holds the particle. 100% means that the particle will follow the fluid exactly. Influence less than 100% causes an approaching of the particle's speed to the fluid's speed. Influence 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 play speed** | *ignoreTimeScale* –  If checked, the **Play speed** attribute of the node and the frame duration during the simulation are not taken into consideration.