Thanks for a quick reply. I'm actually in a situation where I do not have all of the overlays at the same time so I cannot concatenate them.

To put more contexts: I am building surface support into neurovault. When someone uploads a surface statistical map I want to automatically calculate a projection of this map into MNI volume. To improve the MNI volume surface mapping I have reconstructed the surface of the 2009c_asym_nlin template. For every incoming map I am doing fsaverage -> MNI2009c mri_surf2surf followed by mri_surf2vol. However, the mri_surf2surf takes quite a bit of time to run and most of it is spend on coregistration - which is always the same. If only I could calculate the coregistration once and apply it to every incoming map it would speed things up tremendously.

Let me know if you have any ideas.

Best,

Chris

On Thu, Nov 10, 2016 at 10:26 AM, Douglas N Greve <greve@nmr.mgh.harvard.edu> wrote:

You can use mri_concat to create a stack of overlays, then mri_surf2surf
the entire stack, then split the stack.

On 11/10/2016 12:28 AM, Chris Filo Gorgolewski wrote:
> Hi,
> I need to convert a big number of scalar surface maps from fsaverage
> to one particular subject space. This means running mri_surf2surf
> command many times. For each execution the same transformation is
> calculated and then applied. Since estimating the transformation take
> a substantial amount of time I was wondering if I could calculate the
> transformation once and just apply it (which is a common thing in
> volumetric registration). I perused the website and the command line
> options, but I could not find anything. Is it possible to save and
> reuse surface transformations?
>
> Best,
> Chris
>
>

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