  For a foreground object in motion, details of its background which would
otherwise be hidden are uncovered through its inner blur. This paper presents a
novel hybrid motion blur rendering technique combining post-process image
filtering and hardware-accelerated ray tracing. In each frame, we advance rays
recursively into the scene to retrieve background information for inner blur
regions and apply a post-process filtering pass on the ray-traced background
and rasterized colour before compositing them together. Our approach achieves
more accurate partial occlusion semi-transparencies for moving objects while
maintaining interactive frame rates.
