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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 [vertices, faces] = mergeMeshVertices(vertices, faces, vertexInds, varargin)
%MERGEMESHVERTICES Merge two vertices and removes eventual degenerated faces.
%
% output = mergeMeshVertices(input)
%
% Example
% mergeMeshVertices
%
% See also
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2019-01-31, using Matlab 9.5.0.944444 (R2018b)
% Copyright 2019-2023 INRA - Cepia Software Platform
newPos = vertices(vertexInds(1), :);
if nargin > 3
newPos = varargin{1};
end
vertices(vertexInds(1), :) = newPos;
vertices(vertexInds(2:end), :) = NaN;
% replace face-vertex indices by index of first vertex
faces(ismember(faces, vertexInds)) = vertexInds(1);
% need to check existence of degenerated faces with same vertex twice
nFaces = size(faces, 1);
dgnFaces = false(nFaces, 1);
dims = [1 2;1 3;2 3];
for i = 1:3
dgnFaces = dgnFaces | faces(:,dims(i,1)) == faces(:,dims(i,2));
end
% remove degenerated faces
faces(dgnFaces, :) = [];
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