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Now, this is the really interesting one. Putting opacity at the linear anisotropy corner should show you only the white matter fiber tracts, and indeed this looks like white matter. You can see the corpus collosum hiding behind there, and these are the little fingers of white matter extending up to the cortical surface. This one (bottom) is just to emphasize the generality of the barycentric opacity map. Other anisotropy measures (which are functions of the three eigenvalues) can be mapped into this space, and you can visualize the results. Or, you can doodle whatever other shapes you want.

So far we have hue-balls for the color, and barycentric maps for the opacity. Now we need a way to shade diffusion tensors.