Dear afni experts,

I would like to upsample suma surface meshes (so that each of them comprises more vertices and faces) to potentially achieve better accuracy when projecting back and forth between volumetric and surface representations.

SurfMesh seems to the function for this purpose. However, each execution of the following command

SurfMesh -edges 2 -i_fs lh.smoothwm.asc -o_fs hd.lh.smoothwm.asc
gives me a new mesh with doubled vertices (as expected) but differently randomized vertex-index. So that the resulting high resolution smoothwm mesh won't paired easily with an similarly generated high resolution pial mesh.

Is there a way to work around this slightly confusing behavior? Or what is the right way to upsample a surface mesh (while keeping the node-index in a meaningful or at least constant way)?

Thank you very much!

Best regards,