Hi Joel
there is internal code for this where we create a spatial lookup/hash
table and use it to find the closest vertex, but it is just a set of c
functions.
cheers
Bruce
On Tue, 4 Sep 2018, Bruss, Joel E wrote:
External Email - Use Caution
Ah, that makes sense. Short of calculating a Euclidean distance between every
surface RAS and my
point I'd like on the surface, then grabbing the one with the shortest
distance, is there a
function/utility in FreeSurfer that will generate the closest vertex for me?
____________________________________________________________________________________________________
From: freesurfer-boun...@nmr.mgh.harvard.edu
<freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of
Ehsan Tadayon <ehsan.tadayo...@gmail.com>
Sent: Tuesday, September 4, 2018 2:05:05 PM
To: Freesurfer support list
Subject: Re: [Freesurfer] [External] Re: SurfaceRAS to Vertex coordinate system
External Email - Use Caution
[cbb23410d862335b08d6bf64e91c01427a4b6868.png?u=375924]
There is no linear transformation between the two. Vertex coordinate is
equal to
surfaceRAS when the point that you have selected is actually one of the
vertices on the
chosen surface. However, if the point is not on the surface, it finds the
nearest
vertex. So, you can read your surface ( in matlab : [vertices, faces] =
read_surf('lh.pial') ) and then find the vertex that is closest to your
selected point
(surfaceRAS). This is the vertex that you see in the Freeview.
Ehsan.
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