Global inverse transform and global transform


I’m working with this file: glTF-Sample-Models/SimpleSkin.gltf at master · KhronosGroup/glTF-Sample-Models ( and naturally to implement Skins, we have to work with global inverse transform, global transform and inverseBindMatrices, my problem is I can’t find how to calculate the global inverse transform and global transform.

can someone help me with this?

Maybe this section in the glTF tutorials will help?

glTF-Tutorials/ at master · KhronosGroup/glTF-Tutorials (

so, if I understand; the global transform is the inverse of inverseBindMatrice ? but what about the