when you specify -n it write out surface normals instead of surface
locations. Or you can use Doug's method
cheers
Bruce
On Tue, 9 May 2017, Jerry
Jeyachandra wrote:
Hi Bruce,
Thanks for the response. I've run the operation and have examined the
output. From my understanding the file contains both a vertex list (XYZ) and
a face list containing (V1,V2,V3...). Is the XYZ of the vertex list the
actual surfaceRAS coordinates of the surface as viewed on FreeViewer? If so
I can compute face normals simply by matching up the 3 vertices
encapsulating the given surface coordinate and computing the face normal
vector, correct?
Thanks again
Jerry
____________________________________________________________________________
From: freesurfer-boun...@nmr.mgh.harvard.edu
<freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of Bruce Fischl
<fis...@nmr.mgh.harvard.edu>
Sent: May 8, 2017 4:40:17 PM
To: Freesurfer support list
Subject: Re: [Freesurfer] Obtaining surface normal vector from plial
surfaceRAS coordinate
Hi Jerry
mris_convert -n lh.pial lh.pial.normals.asc
should create a list of surface normals in ascii format
cheers
Bruce
On Mon, 8 May 2017,
Jerry
Jeyachandra wrote:
>
> Hi list,
>
> I’d like to extract the surface normal at a location specified in
surfaceRAS
> coordinates after performing segmentation. I know there are methods to
> extract all vertices and faces then compute face normals from there, but
I’m
> not familiar with methods to relate these to specified coordinates.
>
> Thanks
>
> Jerry Jeyachandra
>
>
>
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