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## Copyright (C) 2024 David Legland
## All rights reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are met:
##
## 1 Redistributions of source code must retain the above copyright notice,
## this list of conditions and the following disclaimer.
## 2 Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in the
## documentation and/or other materials provided with the distribution.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS''
## AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
## IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
## ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
## ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
## SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
## CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
## OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##
## The views and conclusions contained in the software and documentation are
## those of the authors and should not be interpreted as representing official
## policies, either expressed or implied, of the copyright holders.
function writeMesh_ply(fileName, vertices, faces, varargin)
%WRITEMESH_PLY Write a mesh into a file in PLY format.
%
% writeMesh_ply(FNAME, VERTICES, FACES)
%
% writeMesh_ply(FNAME, MESH)
%
% writeMesh_ply(..., FORMAT) also specifies a file format for the written
% file. FORMAT can be either 'binary' (default) or 'ascii'.
%
% Example
% mesh = createSoccerBall;
% fileName = 'SoccerBall.ply';
% writeMesh_ply(fileName, mesh, 'Bin');
% mesh2 = readMesh(fileName);
% drawMesh(mesh2); axis equal
%
% See also
% meshes3d, writeMesh, readMesh_ply, writeMesh_off, writeMesh_stl
% ------
% Author: David Legland, oqilipo
% E-mail: david.legland@inrae.fr
% Created: 2018-04-26, using Matlab 9.4.0.813654 (R2018a)
% Copyright 2018-2023 INRA - Cepia Software Platform
%% Check inputs
% optionnaly parses data
if isstruct(vertices)
if nargin > 2
varargin = [{faces} varargin{:}];
end
faces = vertices.faces;
vertices = vertices.vertices;
end
% Parsing
p = inputParser;
addRequired(p,'fileName',@(x) validateattributes(x,{'char'},{'nonempty'}));
suppModes = {'ascii','binary_little_endian'};
addOptional(p,'mode','binary_little_endian',@(x) any(validatestring(x,suppModes)));
parse(p,fileName,varargin{:});
fileName = p.Results.fileName;
mode = suppModes{startsWith(suppModes, p.Results.mode, 'IgnoreCase',1)};
%% Initializations
% number of vertices and faces
nVertices = size(vertices, 1);
nFaces = size(faces, 1);
if iscell(faces)
nFaces = length(faces);
end
% open file for writing text
f = fopen(fileName, 'wt');
if (f == -1)
error('Couldn''t open the file %s', fileName);
end
%% Write Header
% write the header line
fprintf(f, 'ply\n');
% write format (only ASCII supported)
fprintf(f, 'format %s 1.0\n', mode);
% some comments
fprintf(f, 'comment Created by MatGeom for MATLAB\n');
% write declaration for vertices
fprintf(f, 'element vertex %d\n', nVertices);
fprintf(f, 'property double x\n');
fprintf(f, 'property double y\n');
fprintf(f, 'property double z\n');
% write declaration for faces
fprintf(f, 'element face %d\n', nFaces);
fprintf(f, 'property list int int vertex_index\n');
% end of header
fprintf(f, 'end_header\n');
%% Write data
switch mode
case 'ascii'
% write vertex info
format = '%0.17f %0.17f %0.17f\n';
fprintf(f, format, vertices');
% write face info
if isnumeric(faces)
% simply write face vertex indices
ns = size(faces, 2);
plyFaces = [ns * ones(nFaces, 1) faces-1];
format = ['%d' repmat(' %d', 1, ns) '\n'];
fprintf(f, format, plyFaces');
else
% if faces are stored in a cell array, the number of vertices in each
% face may be different, and we need to process each face individually
for iFace = 1:nFaces
ns = length(faces{iFace});
format = ['%d' repmat(' %d', 1, ns) '\n'];
fprintf(f, format, ns, faces{iFace} - 1);
end
end
case 'binary_little_endian'
% close the file
fclose(f);
% open file with little-endian format
f = fopen(fileName,'a','ieee-le');
% write vertex info
fwrite(f, vertices', 'double');
% write face info
if isnumeric(faces)
% simply write face vertex indices
plyFaces = [size(faces, 2) * ones(nFaces, 1) faces-1];
fwrite(f, plyFaces', 'int');
else
% if faces are stored in a cell array, the number of vertices in each
% face may be different, and we need to process each face individually
for iFace = 1:nFaces
fwrite(f, [length(faces{iFace}), faces{iFace}-1], 'int');
end
end
otherwise
error(['Format ''' mode ''' is not supported'])
end
% close the file
fclose(f);
end
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