Would it be possible to shrink a surface with a scaling matrix, and then define the mesh as being in the same space as the original.
E.g a mesh at 1mm scaled down to eg 0.25mm and then redefined as a 1mm surface? The notion here is to generate an outer and inner pair of white matter surfaces. Of course there are issues. The general notion is to then treat these as white and pial surfaces, take their mean and map white matter data using matt's method for mapping gray matter data (scalar diffusion maps). This is less nuts than it sounds in marmoset because the white matter is simple topologically and in terms of gross anatomy , particularly in the caudal half of the brain. In principle there should be a mid thickness line in much of the brains white matter. With a nifti you just change the units in the header. I don't appear to see a gifti equivalent. Thanks Colin
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