Unreal Engine 4 Hair Shader tutorial featuring Hairdini:
This tutorial uses Houdini procedural hair cards using Hairdini, and HDA I have up on GumRoad. HOWEVER, the tutorial doesn't really require you need Houdini and should still be a good follow along as it covers all the Unreal Hair Shader inputs.
It's an 80 minute playlist in 6 parts.
1. Introduction to Hairdini and Unreal's Hair Shader
2. Scatter Map and other basic inputs: Diffuse, Specular, Roughness, Emission etc.
3. Edge Masking and the Opacity Input
4. Flow Maps
5. World Position Offset using Pivot Painter
6. Pixel Depth Offset