I'm not sure if we are still looking for how to insert spine animations into game code or where spine animations are added or set. If we have not, then I think I found something
All Unit objects have a SpineData object property, which has properties that are probably what we are looking for.
SkeletonDataAssetName: man_girl_nude_1
I attached a txt file showing more of the output I gathered of slaves
There is also this method in the SpineData class that has has some parameters thats too much of a hassle for me to find out how to read, though knowing what they are is probably only useful for confirming that this is what we're looking for
Code:
GetSpineData(string figure0Name, string figure0StateName, string figure1Name, string figure1StateName, string roomTypeName, int poseType)
The SpineData class appears to be just storing information about what animations are currently being played for a Unit, there is little logic code here
It has more properties which are also probably also what we're looking
View attachment 2481491
The bottom Slave PartLists (EyeColor, HairColor, HornColor, ScaleColor) are the things of note
Less relevant potential finds:
UpdaterSpineCharacter.cs (Contains method SetAnimation, not sure if useful or not).
StatePlate1.cs and StatePlate2.cs appear to have some logic code that was likely used in earlier development but is likely no longer used (I am not entirely sure)