Let's say that I have a texture with a square, and I apply this texture to the surface of a object. I need to know that exact 3D coordinates of the borders of this square where they have been applied in the object.
My current solution is looking for the closest vertex in the object uv mapping to my desire square coordinates. Then I get the 3D coordinates of that vertex. However this is not an exact solution since I use the closest vertex. I could make it more precise by subdividing the object but I cant do that for other reasons.
Is there a better way to do that?