These are descriptions of the options in the mental ray section of the fur description node.
Use the following attributes to render fur more efficiently and to improve fur render quality in mental ray. These attributes should be used in conjunction with the Volume fur shader. They cannot be used with the Hair Primitive fur shader. See mental ray for Maya Fur render settings for more information.
Controls fur anti-aliasing. This control is independent of the global settings.That is, you can obtain high quality fur even if the global anti-aliasing controls are set to a lower quality. Increase this value for better quality; however, higher values also increase render time. When there is motion blur, a small samples value is generally sufficient. The range is from 1 to 8. Default is 5.
Enables motion blur. For more information, see Motion blur.
Use this feature to accelerate fur self-shadows and shadows cast from one fur object onto another. When this feature is on, self-shadows are not raytraced; instead, they are approximated using a volumetric fur representation. When this feature is on, scenes often render faster.
Use in conjunction with Shadow Density Scale to control the self-shadow opacity.