Take a look at "mris_decimate":
~$>mris_decimate -x
Help
NAME
mris_decimate
SYNOPSIS
mris_decimate [<options>] <input surface> <output surface>
DESCRIPTION
This program reduces the number of triangles in a surface and
outputs
the new surface to a file using the GNU Triangulated Surface (GTS)
Library.
POSITIONAL ARGUMENTS
input surface file
output surface file
REQUIRED FLAGGED ARGUMENTS
None
OPTIONAL FLAGGED ARGUMENTS
-d <decimation level>
target decimation level of new surface (value between
0<-->1.0, default: 0.5). The resulting surface will have
approximately triangles = <decimationLevel> * origTriangles
-m <minimum angle>
The minimum angle in degrees allowed between faces during
decimation (default: 1.0).
--help
print out information on how to use this program
--version
print out version and exit
REPORTING
Report bugs to <freesurfer@nmr.mgh.harvard.edu>
On 12/20/11 10:47, Ecker, Christine wrote:
Dear FreeSurfer Experts,
I would like to down-sample the pial surface of individual subjects to
have the same number of vertices as fsaverage6. I have done so using:
mri_surf2surf --hemi lh --srcsubject 'subjectID' --sval-xyz pial
--trgsubject fsaverage6 --trgicoorder 6 --trgsurfval 'outputfilename'
This worked well and the pial output surface has 40962 vertices. I now
have an overlay vector, which was computed on the down-sampled pial
surface, which I would like to map back to fsaverage6 in order to
perform a group comparison.
Please could you advise on how to do this as all scripts I am aware of
(e.g. mris_preproc) use sphere.reg, which has ~150000 vertices.
Many thanks,
Christine
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--
Rudolph Pienaar, M.Eng, D.Eng / email: rudo...@nmr.mgh.harvard.edu
MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging
149 (2301) 13th Street, Charlestown, MA 02129 USA
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