---
title: "FireSmoke Grid"
canonical: "https://documentation.chaos.com/space/PHX4MAX/124364276/FireSmoke%20Grid"
format: markdown
---
The FireSmoke Grid rollout lets you set the boundaries, size and resolution quality of the sim. Regarding size, the Phoenix Simulator works best when the scale of the container matches the real-world size of the simulated effect. For example, if you are simulating a campfire, your container should be at most a couple of meters wide.

Note that it does not matter if this is two meters or two thousand millimeters - the way you view the units is irrelevant. Phoenix always converts the units to a common world-size length, so the only important thing is the size of the container. If you are simulating a volcano, for example, the container should be several hundred meters wide, or several hundred thousand millimeters.

Using the parameters on this roll-out you can:

- Specify the **Size** and **Resolution** of the Simulator.
- Enable / Disable **Adaptive Grid** which is a performance optimization allowing you to keep the size of the Simulator as small as possible thus reducing RAM usage.
- Specify which **Walls** of the Simulator will be considered **Open** (infinite) or **Jammed** (i.e. as solid obstacles, closed).
- Specify a **Confine Geometry** to limit the fluid calculations only to the volume of the specified object.