How to define the area of the texture to apply to a face

Questions
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1

Hi,
I have a cube made with Three.JS and I want to apply a part of a texture on each face. Concretely, I am looking for a function taking 4 parameters: x1 , y1 , x2 , y2 specifying the area of the texture to apply to the face.
For example, with input [1, 0, 15, 16] (for a texture of 16x16), I want the face texture of right (left is my control cube, [0, 16, 0, 16])

image
image2560×1369 11 KB

If I specify [16, 0, 0, 16]`, my texture is flip.
I think I have to do that with UV (because is relative to the texture and not to the cube itself) but for the moment, I was not able to get a satisfactory result.

I also want that each face is independent. So if I modify the texture UV of one, the texture UV of the others is not modified (even if the texture is the same).

Here a minimal version of my cube (cleaned of all my tests and others things not relative to my issue): Edit fiddle - JSFiddle - Code Playground

Thank you for your answer!