I'm currently creating hair cards for my character and from what I've researched, it seems that I need to create the following hair cards for everything to look good:
(1 Diffuse/Albedo map
(2 Specular Map
(3 Normal Map
(4 Direction/Flow Map
(5 Opacity Map
(6 Ambient Occlusion
I understand how to create all the following in Blender and in Gimp (I want to stick to open source software for everything I create for my character) except for the direction/flow map. I read on other forums that creating a flow map may not be necessary if the UV's are all unwrapped and flowing in the same direction, is that correct? I'm planning on using Unity eventually and Unity has a Master hair shader I may be able to use and on their website, it has a hair strand direction section.
I started trying to create a directional map in Blender using this node setup but I'm not sure how to get the direction/flow colors correct (From the roots to the tip of the hair). Do I even need to create directional maps for my hair cards, and if I do, how can I create this using Blender or possibly another open-source program? Thanks in advance.