Hi Dorian

the transform should be by looking up the spherical coordinates on the
sphere.reg for that vertex index and using that to find the corresponding
fsaverage sphere.reg vertex.

cheers
Bruce

On Wed, 25 Jan 2017, Dorian P. wrote:

> Hi, I am trying to find the corresponding coordinate of a vertex in lh.pial
> in fsaverage space. I manage to transform lh.pial in fsaverage space but
> this does not give corresponding points or a way to do point by point
> transformation.
> I want to do the same with some vertices from lh.pial-outer-smoother. Trying
> to transform this with mri_surf2surf gives an error because obviously there
> is no registration of that mesh. Any idea if this can be achieved at all?
>
> Last question: am I correct assuming that the surface to surface
> registration (sphere.reg) does a better job at matching gyri and sulci on
> fsaverage than the simple conversion in MNI305 (aka fsaverage):
> MNI305RAS = TalXFM*Norig*inv(Torig)*[tkrR tkrA tkrS 1]'
>
> Thank you.
> Dorian
>
>

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