You are correct, it is not an affine matrix. A description of the file’s
content is available at
Essentially, the deformation map file defines a resampling of one surface
Hi Tony et al.
John’s explanation regarding deformation map files is correct. Here, I’m
drawing to your attention the fact that Connectome Workbench (and wb_command)
provides improved methods for mapping from one surface mesh that has been
registered to another (see below). Depending on your
Also Connectome Workbench has some more advanced methods of quantifying
isotropic and anisotropic registration induced distortion.
From: on behalf of Timothy Coalson
Reply-To: "Caret, SureFit, and SuMS software users"
A small addendum: spherical surface registration is not the only use for
measuring surface distortion. If you use it on resampled anatomical
surfaces from different longitudinal timepoints, or from different species,
or just different subjects, you can get a measure of the difference in
It¹s also worth noting that in Connectome Workbench we moved away from the
deformation map file as it enforces a particular resampling of the data as
well (not just a data transformation). Instead we use the deformed and
target spheres to store the registration and this allows for choice in
Hi John and David,
Thanks a lot for your reply! Yes I'm thinking to move from Caret to Workbench
since most of the time we use wb_command a lot and it makes sense to keep our
tools up-to-date and consistent.
Just want to clarify: the weights (last 3 columns) of the vertices (indexed by
Deformation maps are inherently designed for the purpose of going from one
topology (number of triangles and their layout) to a different one, so they
are a tricky thing to try to compare vertexwise. They also don't really
encode warpfield deformations (and even using them to reconstruct as much