These are global settings that apply to all instances of particle hair systems. The resolution of the strands is controlled by the step values in particle settings. Each hair system uses the material identified in the particle settings.
Render curves as flat ribbon with rounded normals, for fast rendering. Curves are subdivided with a fixed number of specified subdivisions.
Render curves as circular 3D geometry, for accurate results when viewing curves close up. Curves are automatically subdivided until the curve is smooth.
These settings control the curve rendering settings used when the 3D viewport is set to Material Preview
Render curves as a thin strand roughly a pixel wide. Curve diameter parameters are ignored with this setting.
Render curves as a flat ribbon with rounded normals.
- Additional Subdivisions
Additional subdivisions to be applied on top of the curve resolution set in the hair system settings. Increasing this value will smooth out the curves of the strands.