1. A method of rendering a graphical scene performed by a processor of a computer, the method comprising: the processor determining a plurality of functions that contribute to a light transport model of the scene; the processor projecting each function of the plurality of functions into a wavelet domain; the processor 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; the processor traversing direct paths through the plurality of wavelet trees, along which direct paths an integral coefficient may be nonzero, to determine a radiance of a point in the scene; and the processor rendering the scene.