Here's an image I made a while ago.

I got the data for the brain from Paul Bourke's file mri.df3, that can be found
in the file mri.tar.gz available at this page:
http://paulbourke.net/miscellaneous/povexamples/

All the voxels with a density above a certain threshold are filled with a
superellipsoid with a color corresponding to the density in each voxel. All
these superellipsoids were made with a single isosurface statement.

The colors were borrowed from the Inferno color map in Matplotlib:
https://matplotlib.org/examples/color/colormaps_reference.html

--
Tor Olav
http://subcube.com

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