There are many instances where mapping a file texture to hair is useful. For example when rendering tiger or leopard fur. This requires texture coordinates from the surface mesh.
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By default Arnold generates UV coordinates in which the V coordinate goes from 0 to 1 along the length (height) of each hair and, when using the ribbon mode, the U coordinate goes across the width of the hair. The following image is obtained by mapping a red to blue ramp texture.
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Workflow
If you want to map a texture across a surface, you must enable the Export UVs on the Hair object and connect the texture to the Diffuse Color of the Standard Hair shader.
- As you can see in the image below, the tiger pattern is defined along the UV of each individual hair fiber length as well as across the object's surface UV's.
