[Freesurfer] normal vector projection

Hi,

After freesurfer reconstruction, I tried to project surface normal vectors on the ribbon. I used the following scripts, but the projected vectors were out of the ribbon when I visualized it freeview. The vectors were placed outside of the ribbon. Anyone knows any idea ?

fslregister --mov mri/orig.mgz --s xDS --reg rrr.dat --dof 12 --tmp ./tmp/ mri_surf2surf --s xDS --hemi lh --sval-nxyz pial --tval ./pl_100.mgz mri_surf2vol --surfval pl_100.mgz --hemi lh --surf pial --volreg rrr.dat --outvol pln_pribbon.mgz --fillribbon --template mri/orig.mgz

Thank in advance,

Seok Lew, Ph.D. MEG Core Laboratory Athinoula A. Martinos Center for Biomedical Imaging Massachusetts General Hospital Harvard Medical School slew@nmr.mgh.harvard.edu