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