---
title: "Liquid Scene Interaction"
canonical: "https://documentation.chaos.com/space/PHX4MAYA/125737180/Liquid%20Scene%20Interaction"
format: markdown
---
This page provides information on the Interaction rollout.

## **Overview**

---

> Macro (ui-text-box)
> 
> It is strongly recommended that each geometry interacting with the fluid simulation:
> 
> - has no open edges or holes;
> - does not self-intersect;
> - has normals pointing outwards.
> 
> Phoenix will try to handle any geometry that does not comply with these conditions, but the simulation might not behave properly. For example, in the case of fire/smoke simulations, some areas of the simulation may lose velocity and freeze for no apparent reason, whereas in liquid simulations, particle explosions can appear.

This rollout is used to enable/disable the interaction with objects in the scene. There are several different types of objects that may affect the simulation: Sources, Solid objects, Forces, etc.

By default, all these scene elements will interact with the simulator unless otherwise specified by the **Interaction Set**. If you want to disable the interaction, you have to put the objects in the **Interaction set**. If there are more objects that don't need to interact with the simulator, you may alternatively switch to the **Include list** mode by un-checking **Exclude List**. In this mode, you need to add to the **Interaction Set** all the objects that you want to interact with the Simulator.

Since all forces affect the simulation by default, adding a force in your scene to be used by nParticles, for example, will also automatically affect your simulation and this might not be desirable. In such cases, you can use the **Interaction Set** to exclude a force if you wish to.

> Macro (ui-text-box)
> 
> UI Path: ||Select [PhoenixFDSim](https://docs-chaos.atlassian.net/wiki/spaces/PHX4MAYA/pages/125765148)|| **> Attribute Editor > Scene Interaction rollout**

##   
**Parameters**

---



### **Geometry**

---


> Macro (viewtracker)