  The purpose of this paper is to present simple and fast methods for computing
control points for polynomial curves and polynomial surfaces given explicitly
in terms of polynomials (written as sums of monomials). We give recurrence
formulae w.r.t. arbitrary affine frames. As a corollary, it is amusing that we
can also give closed-form expressions in the case of the frame (r, s) for
curves, and the frame ((1, 0, 0), (0, 1, 0), (0, 0, 1) for surfaces. Our
methods have the same low polynomial (time and space) complexity as the other
best known algorithms, and are very easy to implement.
