Dimensions of a skin ?

I've got a model that uses two geosets, and for animation reasons I'd like to fuse the two geosets into a single one. But the problem is that both use two skins that can not be combined into one single skin. So I thought I could use a large skin (like the PotM's or the Huntress' ones). I've assumed (is it true ?) that the Tvertices in a geoset give for each vertex the coordinates of the point of the skin that corresponds to it, the first value being X (horizontal) and the second Y (vertical).
I need to know what are the dimensions of a skin for the model (that is, what would be the Tvertex of a vertex that would use the bottom right corner of a skin), to know what value I must add to the X value of all the vertices of the secong geoset (the part that will use the right half of the big skin once I have fused them in one single geoset) before fusing them. Can someone please help ?

The dimensions are always 1 by 1. So you won't actually be adding; you'll be dividing the TVerts of the first geoset by 2 and the second ones will be (oldX-1)/2+1, I guess.

Thanks. Well, this explains why there is not a section specifying if the skin is a "simple" or "double" one. And yes I found new X = (old X + 1)/2, which is the same value.

You can do this by importing these 2 models into 3dsmax 5. And then modifie their uvws.

He he, thanks MaD[Lion], I know that, but... you see... not everyone here can afford to buy 3dsMax. That's why Oinkerwinkle's tools are so wonderful for me. With them I can do a lot of quite complex things I would never be able to do with 3dsMax. Anyway, with the new version of these tools, it will be possible to modify the wrapping of a model.