Why does everyone say "run FNIS for gender-specific animation", isn't that a vanilla feature?

[Vai1lyn]

Hi! This confuses me a bit, so I'm going to ask it here:

 

Under several animation packs (replacing purely vanilla animations), it is told to run FNIS if you want to make that animation specific to females or males.

 

Why is that needed? I have never used FNIS or Nemesis, and gender-specific animations work for me.

 

Shared / male animations are in my Data/meshes/actors/character/animations folder, and female only animations are in Data/meshes/actors/character/animations/female.

 

Also, the game itself seems to support that (Lydia has the inverse gender animation flag set, this implies that there are separate sets for genders).

 

So why should I install & run FNIS after installing purely vanilla animations?

 

Thanks!

[thatguy2000]

I'm not entirely sure about it since I'm still just fumbling around with this, but I'm pretty sure what that means is to just tick off, when you run the FNIS generators, the gender specific animations box on the bottom.

 

if anyone else is more certain or can correct this please to say