1. A processor configured to render an indirect illumination image, comprising: a buffer restructurer configured to organize a reflective shadow map (RSM), rendered with respect to a reference view, into a plurality of unique sub-RSMs, each having sub-RSM pixels; an indirect illumination computer configured to employ interleaved sampling on said plurality of unique sub-RSMs to generate a plurality of indirect illumination sub-images; and a filter operable to smooth accumulated light values of said indirect illumination sub-images for subsequent interleaving into said indirect illumination image.