1. A method for generating a composite image of a scene as viewed from multiple points of view for display on an auto-stereo display comprising a plurality of pixels, comprising: fetching at least a portion of the scene; generating, via a ray tracing algorithm, color values for a first subset of the pixels allocated to a first one of the multiple points of view; and generating, via a ray tracing algorithm, color values for a second subset of the pixels allocated to a second one of the multiple points of view without generating color values for all of the pixels of the display; wherein the color values generated for the first and second subset of the pixels form a composite image.