I have played some more with the Stanford CT head data 
(http://graphics.stanford.edu/data/voldata/), converting the pixels to 
"voxels" ie boxes.

I have rendered it with different cutoff values, as suggested by 
Alastair Murray, and put them together as a sort of animation.

The "worst" of the images contains 1.713.361 boxes and used about 1.4GB 
memory. This is not the last image, as I in the folowing images dropped 
all points with a density over 1000. That includes the brain, which 
represents a large part of the 1.7 mill boxes, none of which are visible 
in the images.

/Ib

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