What i do is i bake alpha hair textures (2048x2048) in xnormal like that:
high poly + "base texture to bake -> pure white"
lowpoly + cage
baking option:
size is intentionally chosen, so i could downsize to 2048x2048 to get a smoother result, but thats does also not seems to work great.
I really dont want to choose the next bigger size (8k btw) only so xnormal bake a good alpha texture out :-S
So what would your suggestions be?