Navigate to (Rendering Menu Set) Fur > Fur Render Settings.
These options are for use with the mental ray for Maya renderer.
Determines the rendering method used to render fur in the mental ray for Maya renderer.
This is the default method for rendering fur in mental ray for Maya. The fur is rendered as geometry using hair primitive objects.
Fur is rendered as a volume shader, consuming less memory and render time in many cases while maintaining the quality of rendering with the Hair Primitive method. The Volume method can be rendered with mental ray Scanline rendering or Rapid Scanline rendering. For more information, see Render Settings: mental ray tab.