Hi afni folks!

Would appreciate your advice.

I'd like to map points between standard meshes of varying densities (MapIcosahedron with varying linear depths). I intend to treat low density mesh points as a subsampling of high density mesh points. It appears that the command to do this is 'SurfToSurf.'

I have two concerns:
1) What surface representation should I use for the meshes that are input into SurfToSurf? I'd think 'sphere' would result in the most proper mapping?

2) Do we expect point mappings to vary significantly between subjects? Or might it suffice to use a single mapping (ex. derived from using standard meshes of a template surface)?
*note: Using the following command, mappings between subjects differ in about 6% of points

dens_from=20
dens_to=141
hemi_type=lh
surf_type=sphere

file_from=std.${dens_from}.${hemi_type}.${surf_type}.gii
file_to=std.${dens_to}.${hemi_type}.${surf_type}.gii

SurfToSurf -prefix map_${dens_from}to${dens_to}_${hemi_type}_${surf_type} -output_params NearestNode DistanceToSurf -i ${file_from} -i ${file_to}

Thanks!
John