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

In the first image I have cut all points with a density under 1500. A 
skull built with Lego. About 336000 blocks.

In the second I have left some meat on the bones. Gross, ain'it?
Density 1050 to 1500 as transparent red boxes, density > 2000 as opaque 
"bone coloured" boxes. There are 1399462 boxes in the scene, and it used 
1.1 GB memory.

/Ib

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