Hair_base_edit Mod
It looks simple, but it is a mod that has changed a lot !
1) Left and right separation is possible.
2) The normal map on the back is also flipped.
3) And crucially, the UV map of the hair rim was completely overhauled.
The purpose was to make the modification easier for me... but I don't think it was completely.
Still, I hope it can be useful somewhere!
