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The V-Ray TexHairSampler is a utility node that provides extra output attributes which can be used when shading hair.

Used with the V-Ray Hair 3 material, this This node allows you to map color, incandescence, and transparency along the length of a hair strand, as well as the ability to randomize such properties on a per-strand basis to create stunning hair looks. 

UI path: ||mat Network|| > V-Ray > Texture: Utility > V-Ray Hair Sampler

The TexHairSapmler node contains the unique input and outputs listed below.

distance_along_strand – Provides information about the shaded part of the hair strand. For the base of the strand, the value is 0.0, and for the tip it is 1.0.

distance_along_strand_absolute – Provides information about the shaded part of the hair strand using absolute distance. This option uses the Hair Max Distance parameter to allow length-dependent mapping. For instance, when used with a gradient, this allows for all hair strands (regardless of length) to have a root color all up to the same length followed by the rest of the ramp. Note that when Strand Max Distance is lower than the actual length of the hair strand, the gradient is repeated over the length of the hair strand.

hair_color – Provides information about the diffuse color along the hair strand.

hair_incandescence – Provides information about the incandescence color along the hair strand.

hair_transparency – Provides information about the transparency along the hair strand.

random_by_strand – Provides a unique random floating point value for each strand in the hair system, which can be used with a ramp texture for example to blend between two colors.

position_across_strand – Allows textures to be mapped across each strand.

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Strand Max Distance –Sets the max strand length. Typically, this value should be equal to the longest strand of hair. 

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The ramp is driven by the Random By Strand parameter.

Resulting render