I am sorry if this question has already been asked (though I could not find anything related).
I am following this (depreciated and incomplete I think) tutorial about skeletal animation, forward and inverse kinematics : docs.godotengine.org/en/3.0/tutorials/3d/workingwith3d_skeletons.html
(my goal is to adapt this tutorial for godot : https://www.alanzucconi.com/2017/04/17/procedural-animations/ )
It uses getpose, getglobalpose, and getbone_rest...
I don't think it's complicated though I don't want to be confused. Can someone explain me the differences between these matrices?