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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 face = meshFace(faces, index)
%MESHFACE Return the vertex indices of a face in a mesh.
%
% FACE = meshFace(FACES, INDEX)
% Return the vertex indices of the i-th face in the face array. This is
% mainly an utility function that manages faces stored either as int
% array (when all faces have same number of sides) or cell array (when
% faces may have different number of edges).
%
% Example
% [v, f] = createCubeOctahedron;
% % some faces are squares
% meshFace(f, 1)
% ans =
% 1 2 3 4
% % other are triangles
% meshFace(f, 2)
% ans =
% 1 5 2
%
% See also
% meshes3d, meshFaceCentroid, meshFaceNormals, meshFaceAreas
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2010-10-06, using Matlab 7.9.0.529 (R2009b)
% Copyright 2010-2023 INRA - Cepia Software Platform
% process mesh given as structure
if isstruct(faces)
if isfield(faces, 'faces')
faces = faces.faces;
else
error('Mesh structure should contains a field ''faces''');
end
end
% switch between numeric or cell array
if isnumeric(faces)
face = faces(index, :);
else
face = faces{index};
end
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