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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
| function M = mvtk_read(filename) | ||
| % Read VTK formatted data from disk | ||
| % FORMAT M = mvtk_read(filename) | ||
| % | ||
| % filename - VTK-formatted file name | ||
| % M - data structure | ||
| %__________________________________________________________________________ | ||
| % | ||
| % VTK File Formats Specifications: | ||
| % http://www.vtk.org/VTK/img/file-formats.pdf | ||
| % | ||
| % Requirements: zstream, base64decode | ||
| %__________________________________________________________________________ | ||
| % Copyright (C) 2015 Wellcome Trust Centre for Neuroimaging | ||
|
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| % Guillaume Flandin | ||
| % $Id: mvtk_read.m 6601 2015-11-19 13:55:32Z guillaume $ | ||
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| [pth,name,ext] = fileparts(filename); | ||
| switch ext | ||
| case '.vtk' | ||
| M = mvtk_read_legacy(filename); | ||
| case {'.vti','.vtp','.vtr','.vts','.vtu'} | ||
| % Serial vtkImageData (structured) | ||
| % Serial vtkPolyData (unstructured) | ||
| % Serial vtkRectilinearGrid (structured) | ||
| % Serial vtkStructuredGrid (structured) | ||
| % Serial vtkUnstructuredGrid (unstructured) | ||
| M = mvtk_read_xml(filename); | ||
| otherwise | ||
| error('Unknown file format.'); | ||
| end | ||
|
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| %========================================================================== | ||
| % function M = mvtk_read_legacy(filename) | ||
| %========================================================================== | ||
| function M = mvtk_read_legacy(filename) | ||
|
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| fid = fopen(filename,'rt'); | ||
| if fid == -1 | ||
| error('Cannot open %s.',filename); | ||
| end | ||
|
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||
| %- Part 1: file version and identifier | ||
| % # vtk DataFile Version 2.0 | ||
| l = fgetl(fid); | ||
| if ~ischar(l), error('VTK file incomplete.'); end | ||
| if ~strncmpi(l,'# vtk DataFile Version',22) | ||
| error('This is not a VTK formatted file.'); | ||
| end | ||
|
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||
| %- Part 2: header | ||
| l = fgetl(fid); | ||
| if ~ischar(l), error('VTK file incomplete.'); end | ||
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| %- Part 3: file format | ||
| format = fgetl(fid); | ||
| if ~ismember(format,{'ASCII','BINARY'}) | ||
| error('Unknown file format.'); | ||
| end | ||
|
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||
| %- Part 4: dataset structure | ||
| data_attributes = false; | ||
| l = fgetl(fid); | ||
| if ~ischar(l), error('VTK file incomplete.'); end | ||
| [D,l] = strtok(l); | ||
| if ~strcmp(D,'DATASET'), error('Invalid VTK file.'); end | ||
| F = strtok(l(2:end)); | ||
| switch F | ||
| case 'STRUCTURED_POINTS' | ||
| warning('Unsupported dataset format.'); | ||
| l = fgetl(fid); | ||
| DIM = sscanf(l,'DIMENSIONS %d %d %d'); | ||
| l = fgetl(fid); | ||
| ORIGIN = sscanf(l,'ORIGIN %f %f %f'); | ||
| l = fgetl(fid); | ||
| SPACING = sscanf(l,'SPACING %f %f %f'); | ||
| case 'STRUCTURED_GRID' | ||
| warning('Unsupported dataset format.'); | ||
| l = fgetl(fid); | ||
| DIM = sscanf(l,'DIMENSIONS %d %d %d'); | ||
| l = fgetl(fid); | ||
| % assume float and n = prod(DIM) | ||
| PTS = textscan(fid,'%f %f %f\n',prod(DIM),'CollectOutput',true); | ||
| PTS = PTS{1}; | ||
| case 'RECTILINEAR_GRID' | ||
| warning('Unsupported dataset format.'); | ||
| l = fgetl(fid); | ||
| DIM = sscanf(l,'DIMENSIONS %d %d %d'); | ||
| l = fgetl(fid); | ||
| XCOORDS = textscan(fid,'%f',DIM(1),'CollectOutput',true); | ||
| XCOORDS = XCOORDS{1}; | ||
| l = fgetl(fid); | ||
| YCOORDS = textscan(fid,'%f',DIM(2),'CollectOutput',true); | ||
| YCOORDS = YCOORDS{1}; | ||
| l = fgetl(fid); | ||
| ZCOORDS = textscan(fid,'%f',DIM(3),'CollectOutput',true); | ||
| ZCOORDS = ZCOORDS{1}; | ||
| case 'POLYDATA' | ||
| while true | ||
| l = fgetl(fid); | ||
| if ~ischar(l), break; end | ||
| [D,l] = strtok(l); | ||
| switch D | ||
| case 'POINTS' | ||
| [N,l] = strtok(l(2:end)); % l still contains dataType | ||
| N = str2double(N); | ||
| M.vertices = textscan(fid,'%f %f %f\n',N,'CollectOutput',true); | ||
| M.vertices = M.vertices{1}; | ||
| case 'POLYGONS' | ||
| [N,l] = strtok(l(2:end)); | ||
| N = str2double(N); | ||
| S = strtok(l); | ||
| S = str2double(S); | ||
| if 4*N ~= S, error('Unsupported dataset format.'); end | ||
| M.faces = textscan(fid,'3 %d %d %d\n',N,'CollectOutput',true); | ||
| M.faces = M.faces{1} + 1; | ||
| case {'VERTICES','LINES','TRIANGLE_STRIPS'} | ||
| error('Unsupported data type.'); | ||
| case {'POINT_DATA','CELL_DATA'} | ||
| data_attributes = true; | ||
| [N,l] = strtok(l(2:end)); | ||
| N = str2double(N); | ||
| break; | ||
| otherwise | ||
| error('Invalid VTK file.'); | ||
| end | ||
| end | ||
| case {'UNSTRUCTURED_GRID','FIELD'} | ||
| error('Unsupported data type.'); | ||
| otherwise | ||
| error('Invalid VTK file.'); | ||
| end | ||
|
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||
| %- Part 5: dataset attributes (POINT_DATA and CELL_DATA) | ||
| if data_attributes | ||
| %l = fgetl(fid); % {POINT_DATA,CELL_DATA} N | ||
| l = fgetl(fid); % SCALARS dataName dataType numComp | ||
| [P,l] = strtok(l); | ||
| [S,l] = strtok(l(2:end)); | ||
| [S,l] = strtok(l(2:end)); | ||
| S = strtok(l(2:end)); S = str2double(S); | ||
| l = fgetl(fid); % LOOKUP_TABLE default | ||
| fmt = repmat('%f ',1,S); | ||
| fmt = [fmt(1:end-1) '\n']; | ||
| M.cdata = textscan(fid,fmt,N,'CollectOutput',true); | ||
| M.cdata = M.cdata{1}; | ||
| end | ||
|
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| fclose(fid); | ||
|
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| %========================================================================== | ||
| % function M = mvtk_read_xml(filename) | ||
| %========================================================================== | ||
| function M = mvtk_read_xml(filename) | ||
|
|
||
| try | ||
| X = xmltree(filename); | ||
| catch | ||
| error('Cannot parse file %s.',filename); | ||
| end | ||
|
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||
| warning('Unsupported file format.'); | ||
| M = struct([]); |
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