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Overview

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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 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

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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.

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.

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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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Usage Examples

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Random by Strand

 

The V-Ray Hair Sampler is set up by connecting an output from the V-Ray Hair Sampler to a 2D driven texture; most commonly a ramp. In this example, V-Ray Hair Sampler's Random By Strand attribute controls the gradient position of a V-Ray Gradient Ramp connected to a V-Ray Hair's diffuse color parameter.

 

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The ramp is driven by the Random By Strand parameter.

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Resulting render

 

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Distance Along Strand

 

Here, V-Ray Hair Sampler is used to create variation in the color along the length of a hair strand to give hair a more natural look. This is done by using the V-Ray Hair Sampler's Distance Along Strand attribute to control gradient position of the ramp connected to a V-Ray Hair's diffuse color parameter. Note that the full ramp is mapped along each strand regardless of the strand's length.

 

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The ramp is driven by the Distance Along Strand parameter.

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Resulting render