Hello i'm exploring the matrix func. inside Babylonjs, a matrix lib can be easy
see here : http://glmatrix.net/docs/module-mat4.html
or very hard see here : https://doc.babylonjs.com/api/classes/babylon.matrix
I kind of understand where the problem occurs, after unsucessfull 3h, i think i might be better to ask the community.
Thanks
https://www.babylonjs-playground.com/#Y7Q181