mistakes

tested application with quad topology when only triangle processing was implemented
made a triangle topo model and kept testing with quads, still NYI
Used relative path where only absolute path was correct
0-base indexing actually indexed from -1
tested for not null instead of is null
did not check array length before indexing it
forgot an assignment and couldn't figure out why a member was always null
tried to debug the wrong method
used the same variable for indexing independent arrays

coming up on 24 hours without sleep

Literally, I am completely serious, I have no fucking idea what made it work. I've been staring at the code for over two hours, it would just never update the PMX scene.
Then it did because apparently Satan was willing to let me keep a tiny shred of my sanity.

Fucking hell, this is why I drink.