1. A Method for computing Fourier coefficients for a Fourier representation of a mask transmission function for the print simulation of a lithography mask used in the manufacture of lithography masks, said lithography masks having use in the manufacture of integrated circuits, the method comprising the steps of: sampling at least one polygon of a mask pattern of the lithography mask to obtain an indicator function defining said one or more polygons; performing a Fourier Transform on said indicator function to obtain preliminary Fourier coefficients; and scaling said preliminary Fourier coefficients to obtain the Fourier coefficients for the Fourier representation of said mask transmission function; wherein at least one of the steps is carried out using a computer device.