Robert, it seams that you are right, I just looked in SketchUp and I saw that they have such a mapping tool. I tried it but with no success because my lamp is modeled in an unsuitable way for mapping, as Jonathan already suggested me.
I shall try, like an exercise, to remodel the lamp and to map the photo (photos). I have good quality photos, from all angles.
Thanks to all, I shall come back with the result.