>"We were able to scale up to large problem sizes
>of over 80 billion voxels per time step and
>generated images up to 16 megapixels,"

It is ~4K cube data and 4K projection plane rendered by Argonne's Blue Gene/P 160000 computing cores... well, it is fine if this "accomplishment" is founded through private founds and it is huge waste if it is paid by tax money. You may do this job interactively on 4 sockets (16 x i-7 cores) machine to spend tax money more efficiently and likely get better performance, you should look for high definition volume rendering I'm quite sure they would love to help you to save tax money.