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The V-Ray Hair material is specifically designed for rendering hair and fur and provides settings for a workflow based on the physiology of real hair. Instead of tweaking arbitrary colors that mix together, the new Hair Next material uses a simple melanin slider that determines the hair color just like in the real world. The material is the product of research based on the paper A Practical and Controllable Hair and Fur Model for Production Path Tracing.

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||shop mat Network|| > Material > V-Ray Material node > V-Ray > Material > Hair

 

 

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 ||mat out Network|| > V-Ray Render Elements node > V-Ray > Material > Hair

 

 

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The BRDFHair node provides inputs for controlling various material properties. They correspond to parameters in the section below.

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Pheomelanin – The redness (pheomelanin content) of the hair strand as fraction of all melanin. 1.0 makes the hair redder. The ratio of melanin to pheomelanin determines how red the hair is. The pheomelanin amount will have has no effect if the melanin is set to 0. See the Pheomelanin example below.

Dye Color – Applies a color tint to the hair. For a dyed hair look, set the melanin to 0, otherwise the melanin will darken darkens the dye color and pheomelanin will introduce introduces redness to it. White means no hair dye. See the Dye color example below.

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Subdivs – Controls the number of samples to use when defining the quality of the final rendering of the material. Lower values will render faster, but the result will be is noisier. Higher values take longer but produce smoother results. This parameter is only available when Use local subdivs is enabled in the DMC Sampler settings.

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Example: Melanin

 

The pigmentation component that gives the hair strand its main color. The higher the value assigned, the higher the concentration of melanin, the darker the hair strands are. In the example below, pheomelanin is set to 0.

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Example: Pheomelanin 

 

The redness (pheomelanin content) of the hair strand as fraction of all melanin. 1.0 makes the hair redder. The ratio of melanin to pheomelanin determines how red your hair is. The pheomelanin amount will have has no effect if melanin is set to 0. In the example below, melanin is set to 0.4.

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Melanin = 0.1

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Melanin = 0.2

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Melanin = 0.3

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Melanin = 0.4

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Melanin = 0.5

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Melanin = 0.6

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Melanin = 0.7

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Melanin = 0.8

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Melanin = 0.9

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Melanin = 1.0

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Phoemelanin Pheomelanin = 0.1

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Phoemelanin Pheomelanin = 0.2

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Phoemelanin Pheomelanin = 0.3

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Phoemelanin Pheomelanin = 0.4

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Phoemelanin Pheomelanin = 0.5

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Phoemelanin Pheomelanin = 0.6

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Phoemelanin Pheomelanin = 0.7

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Phoemelanin Pheomelanin = 0.8

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Phoemelanin Pheomelanin = 0.9

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Phoemelanin Pheomelanin = 1.0

 

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exampleSoftness

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Example: Dye color

 

Applies a color tint to the hair. For a dyed hair look, set the melanin to 0, otherwise the melanin will darken darkens the dye color and pheomelanin will introduce introduces redness to it. White means no hair dye. In the example below, the Dye color is set to pink (H=0,S=250,V=104) and we the hue value is adjusted. Melanin is set to 0.4.

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Example: Softness

 

Controls the overall softness of the hair by how much the highlights are wrapped around the individual hair strands. Higher values make the highlights wrap almost completely around the strands giving the hair a smoother look, while lower values make it look crisper. In the example below, the effect is also shown on a single hair strand. Melanin is set to 0.4.

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The Randomization parameters can be used to introduce variation of the general parameter values. When using randomization, different hair strands will receive slightly different values for the below parameters, so in fact the randomization works on a per strand basis.

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Tangent – Adds a random offset to the hair tangent. This makes the hair stands receive light from slightly different directions, which also means that the highlights will be are placed in slightly different places for each strand. Note that this parameter is depends on the scene scale.

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