After seeing Ben Mathis'/Poopinmymouth's tutorial on how to do flow maps in PaintShop Pro, I realized that there's a very simple way to create flow maps in Photoshop using a simplified version of his method. First, either render out or copy the cone normal from Ben's tutorial: It helps if this cone image is the same size…
@fatihG_Dude thank you so much, this is the one and only tutorial I could find on the whole internet that helped me further with my hair direction map. Thank you all in this topic :)