Conceive that a 2-D texture image has a horizontal axis, u,
and a vertical axis v. The bottom left corner of the image is
at the origin, (0, 0).
No matter what the size of a rectangle texture image are, the
axes are scaled so that the top right corner is always at (1,
1).
(0,0)
1
1
u
v
(1,1)
(0,0)
1
1
u
v
(1,1)