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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 varargout = concatenateMeshes(varargin)
%CONCATENATEMESHES Concatenate multiple meshes.
%
% [V,F] = concatenateMeshes(V1,F1,V2,F2, ...)
% Returns one mesh represented by vertices V and faces F by concatenating
% the meshes defined by V1, V2, ... and F1, F2, ...
%
% [V,F] = concatenateMeshes(MESH1, MESH2, ...)
% where MESH1, MESH2, ... are structs or struct arrays with the fields
% vertices and faces
%
% See also
% splitMesh
% ------
% Authors: oqilipo (parsing), Alec Jacobson (loop)
% E-mail: N/A
% Created: 2017-09-12
% Copyright 2017-2023
%% parsing inputs
assert(~isempty(varargin))
if isstruct(varargin{1})
VF_fields = {'vertices','faces'};
errorStructFields=['If the first input argument is a struct '...
'with the fields vertices and faces the additonal ' ...
'arguments must have the same format'];
% Check, if all input arguments are structs
assert(all(cellfun(@isstruct, varargin)), errorStructFields)
% Check, if all structs contain the two fields vertices and faces
assert(all(cellfun(@(x) all(ismember(fieldnames(x), ...
VF_fields)), varargin)), errorStructFields)
if length(varargin)==1
errorArgAndStructLength = ['If the input is only one struct ' ...
'it has to contain more than one mesh.'];
assert(length(varargin{1})>1, ...
errorArgAndStructLength)
end
% Order of the fields: vertices, faces
varargin = cellfun(@(x) orderfields(x, VF_fields),varargin, 'UniformOutput',0);
% Convert the structs into one cell array
varargin = ...
cellfun(@struct2cell, varargin, 'UniformOutput', false);
varargin = cellfun(@squeeze, varargin, 'UniformOutput',0);
varargin = reshape([varargin{:}],[],1)';
end
NoA = length(varargin);
assert(mod(NoA,2)==0);
cellfun(@(x) validateattributes(x, {'numeric'},...
{'size',[NaN,3],'finite'}), varargin(1:2:end))
cellfun(@(x) validateattributes(x, {'numeric'},...
{'integer'}), varargin(2:2:end))
% Check if all faces have the same number of columns
errorFacesRows='The faces of all meshes must have the same number of columns';
assert(numel(unique(cellfun(@(x) size(x,2), varargin(2:2:end))))==1, errorFacesRows)
%% loop
v=[];
f=[];
for m = 1:NoA/2
vm = varargin{2*m-1};
fm = varargin{2*m};
f = [f; fm+size(v,1)]; %#ok<AGROW>
v = [v; vm]; %#ok<AGROW>
end
%% parsing outputs
[v, f] = trimMesh(v, f);
switch nargout
case 1
mesh.vertices=v;
mesh.faces=f;
varargout{1}=mesh;
case 2
varargout{1}=v;
varargout{2}=f;
end
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