Mere ignorant speculation on my part. You know what the xy coordinates for the lips on each texture. I'm assuming you'd have to use percentages to accomodate different scales so the lips are always at X% of the width over and Y% down and you know the size of the bounding rectangle you position and rescale as necessary. Which is probably completely wrong :-) I program databases, not pixels. Changing the mapping adds a third axis to complicate things of course. It seems though that if you can create an application like the Tailor that manipulates one set of 3d coordinates in relation to another set then you should be able to do the same with the texture mapping coordinates, at least as a good approximation that would make completing it manually easier. I'm sure someone can explain why it's totally impractical. Also, of course, there are going to be times when as bijouchat says, the maping really needs to has to be redone. With the new "digital clones" they are probably at the point where the laser scanner can pull the geometry and the texture off in one go, already mapped. If not now, soon.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken