The flat wrap conforms to the faces of an object as if the texture were a piece of rubber that was stretched over the object.
The [u v] coordinates are derived from a vector [x y z] by using the following equations:
In these formulas, s is the window-scaling factor and o is the window origin. The application should choose a pair of scaling factors and offsets that map the ranges of x and y to the range from 0 to 1 for u and v.