Accessing Texturing Coordinates
Texture Coordinates are used to store the placement of textures
on polygonal surfaces. Texture Coordinates have a range of 0,0
to 1,1 (though they can be repeated) and tells Maya which part
of the texture to apply to any given polygon.
As with vertices, texture coordinates can also be shared by
more than one polygonal face. The faces then store indices into
the texture coordinate array. Normally there is NO correlation
between the indices for vertices and those of the texture coords.
ie, if a given point on a polygon uses vertex 0, it is not guarenteed
that it will use texture coord 0.