I am trying to do some sort of mapping of a flat surface onto a curved one. I have meshed and then fit a BSpline through the nodes of the curved surface in order to have one single surface representing the curved surface (i.e. eliminate any construction lines basically). This allowed to have one single set of coherent uv-parameter for my surface. Now my problem is that the uv parameters I have obtained are normalised and I therefore lose any sense of length. Any idea on how to demormalise them?