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Level of detail – When enabled, V-Ray will generate less fur geometry for parts of the scene which are far away from the camera. This is done by decreasing the density of the fur strands and increasing their thickness. The level of detail function helps for two things. One, it conserves memory by decreasing the detail where it is too far to be visible, and two - it helps to reduce animation flickering of very fine fur strands when they are far from the camera.

Start distance – The distance from the camera at which V-Ray is going to start implementing the level of detail adjustment. Up to this distance the fur will be generated as specified by the user, after that V-Ray is going to decrease the density and increase the thickness of the strand by a factor of two for every n units of space specified by the Rate parameter.

Rate – The rate at which the the detail adjustment is applied. Starting from the distance specified in the Start distance parameter V-Ray is going to decrease the density and increase the thickness of the strands by a factor of two for every n units of space specified by the Rate parameter.

 You can control some aspects of VRayFur with texture maps. These can be either bitmaps, or vertex color maps painted directly on the source object. Some of these texture maps (like Bend and Initial direction) represent vectors in texture space, where the X and Y directions are derived from the U and V directions of a texture UV set.

UV bases set – Specifies which UV mapping channel is used.

Bend direction texture – A RGB map which specifies a bend direction of the fur strands, in texture space (according to the specified Base map channel). This is the direction in which the fur strands curve to (the amount of curvature is also controlled by the Bend parameter). The red component is offset along the u texture direction, the green component is the offset along the v texture direction, and the blue component is the offset along the surface normal.

Initial direction texture – A RGB map which specifies the initial direction of the fur strands, in texture space (according to the specified Base map channel). The red component is offset along the u texture direction, the green component is the offset along the v texture direction, and the blue component is the offset along the surface normal.

Length/Thickness/Gravity/Bend texture – These maps are multipliers for the corresponding parameters, where black is a multiplier of 0.0, and white is a multiplier of 1.0.
Note: the alpha output of the textures is used, so you may need to enable the Alpha Is Luminance attribute for the textures.

Density texture – This map is a multiplier for the strand density. Black portions of the map correspond to zero density (effectively no fur will be generated in these areas), and white represents the normal strand density, as specified by the distribution parameters. Note that the alpha output of the texture is used, so you may need to enable its Alpha Is Luminance option.