We address the main shortcomings of the voxel-based multi-bounce global illumination method of Chatelier and Malgouyres (2006) , by introducing an iterated cached method which allows increasing sampling coarseness at each bounce for improved efficiency, and by introducing a ray-tracing based reconstruction process for a better final image quality. The result is a competitive accurate multi-bounce global illumination method with octree voxel-based irradiance caching.