This script is greatly inspired by Komojo's work from the following thread : https://blenderartists.org/t/playstation-1-jittery-texture-effect-not-for-a-game/1167818 ...

Importing a gltf file exported from Blender 2.79 or 2.8, normals do not conform to the one of the created object. On the left the object created in Blender, on the right the same object exported and ...