I would like to get a mesh outline for my volumetric data, preferably in .ply format. I have found that AFNI's ConvexHull executable does pretty much what I need, except, of course, that the shape is convex. I am working with mouse brains, which have quite a bit of concavity (though a lot less than the human brain).
Any idea how I can get a nice mesh model from my NIfTI templates?