Requires Unity 5.5.1 or higher.
Requires DX11.
Demo Documentation Forum
Hair tool is a plugin for creating animated human hair. Hair consist of nearly 20000 individual stands. 40 - 500 of them are simulated with a physics engine, others are tesselated and interpolated.
Physics are implemented with a custom engine based on Verlet integration, and executed on GPU (Compute Shader). You can configure elasticy, gravity, drag, and curveness in editor. Sphere Colliders can be added to bones so it interacts with body a realistically. Unity WindZone component is supported.
Lighting is based on Kajiya-Kay reflection model. Dirrectional, Point, Spot lights and Cookies are supported.
Shadows are implemented as a Unity shadow caster pass.
Editor is integrated in Unity. Also you can create hair geometry with Blender and 3dmax.