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# faces_connectivity

## (Toolbox/faces_connectivity.m in BrainStorm 2.0 (Alpha))

### Function Synopsis

    TriConn = faces_connectivity(FV,VERBOSE);

### Help Text

    FACES_CONNECTIVITY - Generate the connections of faces to a vertex
     function TriConn = faces_connectivity(FV,VERBOSE);
     FV is the standard matlab structure for faces and vertices,
      where FV.faces is m x 3, and FV.vertices is n x 3.

     TriConn returned is vector of cells, one-to-one with each row of FV.vertices.
     TriConn{i} returns a row vector of the face numbers (rows in FV.faces) that
      are connected to the ith vertex row in FV.vertices.

     Thus if we want the faces numbers for a given set of vertices, TriConn{i} will tell
      us which faces to use in for instance a patch command.

     See also VERTICES_CONNECTIVITY

### Listing of function C:\BrainStorm_2001\Toolbox\faces_connectivity.m

    function TriConn = faces_connectivity(FV,VERBOSE);
    %FACES_CONNECTIVITY - Generate the connections of faces to a vertex
    % function TriConn = faces_connectivity(FV,VERBOSE);
    % FV is the standard matlab structure for faces and vertices,
    %  where FV.faces is m x 3, and FV.vertices is n x 3.
    %
    % TriConn returned is vector of cells, one-to-one with each row of FV.vertices.
    % TriConn{i} returns a row vector of the face numbers (rows in FV.faces) that
    %  are connected to the ith vertex row in FV.vertices.
    %
    % Thus if we want the faces numbers for a given set of vertices, TriConn{i} will tell
    %  us which faces to use in for instance a patch command.
    %
    % See also VERTICES_CONNECTIVITY

    %<autobegin> ---------------------- 26-May-2004 11:30:15 -----------------------
    % --------- Automatically Generated Comments Block Using AUTO_COMMENTS ---------
    %
    % CATEGORY: Visualization
    %
    % At Check-in: $Author: Mosher $  $Revision: 14 $  $Date: 5/26/04 9:59a $
    %
    % This software is part of BrainStorm Toolbox Version 2.0 (Alpha) 24-May-2004
    %
    % Principal Investigators and Developers:
    % ** Richard M. Leahy, PhD, Signal & Image Processing Institute,
    %    University of Southern California, Los Angeles, CA
    % ** John C. Mosher, PhD, Biophysics Group,
    %    Los Alamos National Laboratory, Los Alamos, NM
    % ** Sylvain Baillet, PhD, Cognitive Neuroscience & Brain Imaging Laboratory,
    %    CNRS, Hopital de la Salpetriere, Paris, France
    %
    % See BrainStorm website at http://neuroimage.usc.edu for further information.
    %
    % Copyright (c) 2004 BrainStorm by the University of Southern California
    % This software distributed  under the terms of the GNU General Public License
    % as published by the Free Software Foundation. Further details on the GPL
    % license can be found at http://www.gnu.org/copyleft/gpl.html .
    %
    % FOR RESEARCH PURPOSES ONLY. THE SOFTWARE IS PROVIDED "AS IS," AND THE
    % UNIVERSITY OF SOUTHERN CALIFORNIA AND ITS COLLABORATORS DO NOT MAKE ANY
    % WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
    % MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, NOR DO THEY ASSUME ANY
    % LIABILITY OR RESPONSIBILITY FOR THE USE OF THIS SOFTWARE.
    %<autoend> ------------------------ 26-May-2004 11:30:15 -----------------------

    % ----------------------------- Script History ---------------------------------
    % Author: John C. Mosher, Ph.D.
    % 19-Nov-99 Based on May 1998 scripts.
    % JCM 19-May-2004 Comments cleaning
    % ----------------------------- Script History ---------------------------------

    if(~exist('VERBOSE','var')),
       VERBOSE = 1; % default non-silent running of waitbars
    end

    nv = size(FV.vertices,1);
    [nf,ns] = size(FV.faces); % number of faces, number of sides per face

    TriConn = cell(nv,1); % one empty cell per vertex

    if(VERBOSE),
       % disp(sprintf('Processing %.0f faces',nf))
       hwait = waitbar(0,sprintf('Processing the Triangle Connectivity for %.0f faces',nf));
       drawnow %flush the display
    end

    for iv = 1:nf, % use each face's information
       if(VERBOSE)
          if(~rem(iv,max(1,round(nf/10)))), % ten updates
             % fprintf(' %.0f',iv);
             waitbar(iv/nf,hwait);
             drawnow %flush the display
          end
       end
       for i = 1:ns, %each vertex of the face
          TriConn{FV.faces(iv,i)}(end+1) = iv;
       end
    end
    close(hwait);

    return

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