Reading Textures relation to Mesh (Mapping)

Hey guys,

I have a Mesh that I’ve drawn on in Paint3D, now I want to read the Texture in relation to the Mesh. So that I’ll get the Texture and the unrolled Mesh on top of it.

In the end I’m interested in the brightness on certain parts of the Mesh.

It that possible? I just want to read the mapping information.