Bezier Matrices

GB = ( P1 ) MB = (-1   3  -3  1)
     ( P2 )      ( 3  -6   3  0)
     ( P3 )      (-3   3   0  0)
     ( P4 )      ( 1   0   0  0)


T =  ( t3   t 2   t    1)  

Q(t) = T MB GB