Re: [Freesurfer] Obtaining surface normal vector from plial surfaceRAS coordinate

YOu can use mri_surf2surf with the --sval-nxyz option too

On 05/08/2017 04:40 PM, Bruce Fischl wrote:

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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