1. A method of rendering a graphical scene comprising: determining a plurality of functions that contribute to a light transport model of the scene; projecting each function of the plurality of functions into the wavelet domain; encoding basis coefficients of each function in a wavelet tree, each function being encoded in at least one wavelet tree such that the plurality of functions are represented in the wavelet domain by a plurality of wavelet trees; traversing direct paths through the plurality of wavelet trees, along which direct paths an integral coefficient may be nonzero, to determine the radiance of a point in the scene; and rendering the scene.