Blender UV mapping polyhedra

Hey here I am again.

I have made some polyhedra with the meshbuilder and would like to give it a certain uv mapping, but I’m confused how I’m supposed to apply it.

I have this with a texture I got from blender uv export.

I’m not sure how I can map the specific triangles in the texture to the faceUVs as you need to provide a Vector4.

I’ve also tried using a uv map with separate faces and then mapping faceUV over it, but to no real success sadly :frowning:

I’ve also tried a uv map with just a single triangle to see if I could arrange that, but that also went bad.