Use the commands:
mri_surf2surf --s subject --hemi lh --sval-tal-xyz white --tval-xyz --tval lh.white.tal

mris_convert lh.white.tal lh.white.tal.asc

Ref: https://mail.nmr.mgh.harvard.edu/pipermail//freesurfer/2009-August/011618.html 
You can make search in previous answers of the mailing list using: 
http://surfer.nmr.mgh.harvard.edu/
or
http://surfer.nmr.mgh.harvard.edu/fswiki/UserContributions/FAQ

cheers,

PPJ


----------------------------------------------------------
Pedro Paulo de M. Oliveira Junior
Diretor de Operações
Netfilter & SpeedComm Telecom
--- Novo Netfilter 3.4 www.Netfilter.com.br
--- Novo Netfilter Small Business





On Tue, May 4, 2010 at 08:14, Ana Catarino <am.catarino@gmail.com> wrote:
Hello,
 
Does anyone know if there is a way of getting access to the values of thickness for each vertex in the mesh?
 
Thank you,
Ana Catarino


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