A polar cosine
A polar cosine. This really only makes sense in 2-D or 3-D. This function generates the value:
Magnitude * cos( 2*pi*((Fr, Ft, Fp).(R,THETA,PHI)) + P)where R, THETA and PHI are the pixel position in polar coordinates, Fr,Fr and Fp are the corresponding frequencies, and P is the phase.
generated by doc++