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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