Need some help with code

[Max Murtazin]

The code will be more efficient and easier to understand if you represent points as a Vector3 and use something like Vector3.Transform instead of making everything a matrix. Linear algebra libraries have different conventions for whether matrices are row-major or column-major, which also influences the order of multiplication. I would recommend decomposing your accumulated matrices to make sure the translation, rotation, and scale matches what you would expect. It's easy to transpose or flip the order somewhere by mistake.

I do use both Vector3 and Matrix4x4 already