[Mne_analysis] mne_read_surfaces

[Li Su]

Thank you very much, Dan! I think you are right. I have just done some tests and they all shown correctly. 
Have a nice holiday!
Li Su


-----Original Message-----
From: Daniel G Wakeman [mailto:dgwakeman at gmail.com] 
Sent: 30 December 2010 05:37
To: Li Su
Cc: mne_analysis at nmr.mgh.harvard.edu
Subject: Re: [Mne_analysis] mne_read_surfaces

Hi Li Su,

The vertex number used is actually the index that one would use to identify the vertex in the .rr field. Therefore it is the FreeSurfer vertex number +1. Try examining the same three numbers -1 (each).

D
On 2010 Dec 29, at 22:08 , Li Su wrote:

> Dear MNE group,
> 
> Sorry to bother people during the Christmas and New Year break. I have a question about how to load the surface files in order to analyse triangulation information.
> 
> I use the mne_read_surfaces function in Matlab to load the surface information of the whole brain. As stated in the manual, it returns a structure with a field .tris, which indicates "vertex numbers of triangles in counter clockwise order as seen from outside". To valid if the vertices in each raw of this field are indeed forming a tiny triangle, I visualise them using mne_analyse with the same surface loaded.
> 
> Then, I performed a series of test by typing some random raws of the field of .tris in the bottom part of the GUI where it says "vertex # :". A tiny red cross appears on the surface marking out where the vertex is. I marked out all three vertices from the same raw of .tris. However, I was very surprised to see that these red crosses are way apart from each other and not forming a triangular shape!
> 
> I am not sure if I misunderstand what this triangulation information really means, or there is anything else I did wrong.
> 
> Many thanks for your answer and helps!
> 
> Li Su
> 
> --
> Li Su, PhD
> 
> MRC Cognition and Brain Sciences Unit
> 15 Chaucer Road
> Cambridge CB2 7EF
> United Kingdom
> 
> Phone +44 1223 273632 (direct line)
> 
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