 and reads surfaces in Amira hxsurf
    format. Traced neurons can be imported from and written to SWC and Amira
    LineSet and SkeletonGraph formats. These data can then be visualised in 3D
    via rgl, manipulated including applying calculated registrations, e.g.
    using the CMTK registration suite, and analysed. There is also a simple
    representation for neurons that have been subjected to 3D skeletonisation
    but not formally traced; this allows morphological comparison between
    neurons inclu