Just watch part of this video
https://www.youtube.com/watch?v=5kYLDbr03fk&list=PLuARePS6R4YTz_BtQPBkIakr_eyvDE6q7&index=10
this sucks ass
Tarnished model FBX: drive.google.com/file/d/1XTglBkTN6Ij5_2MLZsSYfXXEOAJP-peb/view?usp=sharing