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# readdfs

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

### Function Synopsis

    [NFV,hdr]=readdfs(s)

### Help Text

    READDFS - (overwrite succinct one line summary here)
     function [NFV,hdr]=readdfs(s)
     WRITEDFS Writes a Duff Surface file (dfs).
       WRITEDFS(FILENAME,NFV) writes the file specified by FILENAME string.

     DFS has the following structure:
       NFV.faces    : the face data,
       NFV.vertices : the face data,
       NFV.res      : voxel dimensions [xres yres zres]'
     Examples

     Author : David Shattuck (shattuck@loni.ucla.edu)

    	char magic[8];			// Magic number (DUFFSURF on little-endian machines or byte-swapped equivalent on other architectures)
    	char version[4];		// A number in the format 1.1.1.1
    	int32 hdrsize;			// Size of complete header (i.e., offset of first data element)
    	int32 mdoffset;			// Start of metadata.
    	int32 pdoffset;			// Start of patient data header.
    	int32 nTriangles;		// Number of triangles
    	int32	nVertices;		// Number of vertices
    	int32 nStrips;			// Number of triangle strips
    	int32 stripSize;		// size of strip data
    	int32 normals;			// 4	Int32	<normals>	Start of vertex normal data (0 if not in file)
    	int32 uvStart;			// Start of surface parameterization data (0 if not in file)
    	int32 vcoffset;			// vertex color
    	uint8 precision;		// Vertex Precision -- usually float32 or float64
    	uint8	pad[3];				// padding
    	float64 orientation[4][4]; //4x4 matrix, affine transformation to world coordinates

### Cross-Reference Information

This function is called by

    subject_editor                     C:\BrainStorm_2001\Toolbox\subject_editor.m

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

    function [NFV,hdr]=readdfs(s)
    %READDFS - (overwrite succinct one line summary here)
    % function [NFV,hdr]=readdfs(s)
    % WRITEDFS Writes a Duff Surface file (dfs).
    %   WRITEDFS(FILENAME,NFV) writes the file specified by FILENAME string.
    %
    % DFS has the following structure:
    %   NFV.faces    : the face data,
    %   NFV.vertices : the face data,
    %   NFV.res      : voxel dimensions [xres yres zres]'
    % Examples
    %
    % Author : David Shattuck (shattuck@loni.ucla.edu)
    %
    %    char magic[8];            // Magic number (DUFFSURF on little-endian machines or byte-swapped equivalent on other architectures)
    %    char version[4];        // A number in the format 1.1.1.1
    %    int32 hdrsize;            // Size of complete header (i.e., offset of first data element)
    %    int32 mdoffset;            // Start of metadata.
    %    int32 pdoffset;            // Start of patient data header.
    %    int32 nTriangles;        // Number of triangles
    %    int32    nVertices;        // Number of vertices
    %    int32 nStrips;            // Number of triangle strips
    %    int32 stripSize;        // size of strip data
    %    int32 normals;            // 4    Int32    <normals>    Start of vertex normal data (0 if not in file)
    %    int32 uvStart;            // Start of surface parameterization data (0 if not in file)
    %    int32 vcoffset;            // vertex color
    %    uint8 precision;        // Vertex Precision -- usually float32 or float64
    %    uint8    pad[3];                // padding
    %    float64 orientation[4][4]; //4x4 matrix, affine transformation to world coordinates

    %<autobegin> ---------------------- 26-May-2004 11:34:12 -----------------------
    % --------- Automatically Generated Comments Block Using AUTO_COMMENTS ---------
    %
    % CATEGORY: Utility - General
    %
    % At Check-in: $Author: Mosher $  $Revision: 6 $  $Date: 5/26/04 10:02a $
    %
    % 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 11:34:12 -----------------------

    fid=fopen(s,'rb','ieee-le');
    if (fid<0) error('unable to open file'); end;
    %hdr.magic = ['D' 'U' 'F' 'F' 'S' 'U' 'R' 'F']';
    hdr.magic=char(fread(fid,8,'char'));
    hdr.version=fread(fid,4,'char');
    hdr.hdrsize=fread(fid,1,'int32');
    hdr.mdoffset=fread(fid,1,'int32');
    hdr.pdoffset=fread(fid,1,'int32');
    hdr.nTriangles=fread(fid,1,'int32');
    hdr.nVertices=fread(fid,1,'int32');
    hdr.nStrips=fread(fid,1,'int32');
    hdr.stripSize=fread(fid,1,'int32');
    hdr.normals=fread(fid,1,'int32');
    hdr.uvStart=fread(fid,1,'int32');
    hdr.vcoffset=fread(fid,1,'int32');
    hdr.precision=fread(fid,1,'int32');
    hdr.orientation=fread(fid,[4 4],'float64');
    hdr.orientation;
    fseek(fid,hdr.hdrsize,-1);
    NFV.faces = fread(fid,[3 hdr.nTriangles],'int32')+1;
    NFV.vertices=fread(fid,[3 hdr.nVertices],'float32');
    NFV.faces=NFV.faces';
    NFV.vertices=NFV.vertices';
    if (hdr.normals>0)
    %    display('reading normals.');
        fseek(fid,hdr.normals,-1);
        NFV.normals = fread(fid,[3 hdr.nVertices],'float32')';
    end;
    if (hdr.vcoffset>0)
    %    display('reading color.');
        fseek(fid,hdr.vcoffset,-1);
        NFV.vcolor = fread(fid,[3 hdr.nVertices],'float32')';
    end;
    if (hdr.uvStart>0)
    %    display('reading uv.');
        fseek(fid,hdr.uvStart,-1);
        uv = fread(fid,[2 hdr.nVertices],'float32');
        NFV.u = uv(1,:);
        NFV.v = uv(2,:);
    end;
    fclose(fid);

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