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HOW TO : projecting the simulated hair results onto a piece of geometry, in Photorealistic Character document

Hair Textures

In this use of the UE4 Hair shader, the final result is driven by five primary textures: Diffuse, Alpha, Root, Depth, and a unique-per-strand ID texture. At Epic, these textures are typically generated using 3ds Max’s Hair system, projecting the simulated hair results onto a piece of geometry. However, there are many available options for similar results.