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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 = trimMesh(varargin)
%TRIMMESH Reduce memory footprint of a polygonal mesh.
%
% [V2, F2] = trimMesh(V, F)
% Unreferenced vertices are removed.
% Following functions are implemented only for numeric faces:
% Duplicate vertices are removed.
% Duplicate faces are removed.
%
% Example
% [V, F] = createIcosahedron;
% F(13:20, :) = [];
% [V2, F2] = trimMesh(V, F);
% figure; drawMesh(V2, F2)
% view(3); axis equal;
% axis([-1 1 -1 1 0 2])
%
% See also
% meshes3d, clipMeshVertices
% ------
% Author: David Legland, oqilipo
% E-mail: david.legland@inrae.fr
% Created: 2014-08-01, using Matlab 8.3.0.532 (R2014a)
% Copyright 2014-2023 INRA - Cepia Software Platform
% parse input data
[vertices, faces] = parseMeshData(varargin{:});
if isnumeric(faces)
% Process meshes with faces given as Nf-by-3 or Nf-by-4 numeric arrays
% Delete duplicate vertices
[tempVertices, tempFaces] = removeDuplicateVertices(vertices, faces);
% Delete unindexed/unreferenced vertices
[tempVertices2, tempFaces2] = removeUnreferencedVertices(tempVertices, tempFaces);
% Delete duplicate faces
[~, uniqueFaceIdx, ~] = unique(tempFaces2, 'rows');
duplicateFaceIdx = ~ismember(1:size(tempFaces2,1), uniqueFaceIdx);
[vertices2, faces2] = removeMeshFaces(tempVertices2, tempFaces2, duplicateFaceIdx);
elseif iscell(faces)
% Process meshes with faces given as cell array of row vectors
nVertices = size(vertices, 1);
nFaces = length(faces);
% identify vertices referenced by at least one face
vertexUsed = false(nVertices, 1);
for iFace = 1:nFaces
face = faces{iFace};
vertexUsed(face) = true;
end
vertices2 = vertices(vertexUsed, :);
% compute map from old index to new index
inds = find(vertexUsed);
newInds = zeros(nVertices, 1);
for iIndex = 1:length(inds)
newInds(inds(iIndex)) = iIndex;
end
% change labels of vertices referenced by faces
faces2 = cell(1, nFaces);
for iFace = 1:nFaces
faces2{iFace} = newInds(faces{iFace})';
end
else
error('matGeom:trimMesh', ...
'Unsupported representation for mesh faces');
end
% format output arguments
varargout = formatMeshOutput(nargout, vertices2, faces2);
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