> For the complete documentation index, see [llms.txt](https://help3.depence.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help3.depence.com/depence-rendering/depence-video-rendering/depence-physics-and-framerates.md).

# Physics and Framerates

Depence features a real-time physics engine for fluid dynamics, which highly depends on the current render framerate.

The calculation of fluid dynamics takes several parameters into account. The amount of particles at a given position is also very important for density and pressure calculation.

While only a solid number of particles can be emitted per frame it is therefore essential to keep the framerate as constant as possible, otherwise, these calculations would no longer work as expected.

{% hint style="info" %}
The engine was optimized for a framerate of 60fps, which should be always the target framerate for animations.
{% endhint %}