AMD TressFX is a software library which provides for advanced simulation and rendering of hair, fur, and grass to be processed by the GPU.

Released as part of GPUOpen AMD TressFX is free and open-source software subject to the MIT License.

Each strand reacts to different physical forces such as gravity, inertia, wind, and the movement of a character's head.

High performance video cards may have enough resources available that the extra effort of rendering hair may produce negligible or acceptable frame rate losses.

An integration into the Epic Games Unreal Engine 4.22 is provided including detailed documentation.

[5] PureHair is a version of TressFX modified by Square Enix for use in Rise of the Tomb Raider.