Compiled test.osl -> test.oso
u = 0, v = 0  =>  s = 0, t = 0
u = 1, v = 0  =>  s = 1, t = 0
u = 0, v = 1  =>  s = 0, t = 1
u = 1, v = 1  =>  s = 1, t = 1

