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// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2020 Alec Jacobson <alecjacobson@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public License
// v. 2.0. If a copy of the MPL was not distributed with this file, You can
// obtain one at http://mozilla.org/MPL/2.0/.
#ifndef IGL_FACET_ADJACENCY_MATRIX_H
#define IGL_FACET_ADJACENCY_MATRIX_H
#include <Eigen/Core>
#include <Eigen/Sparse>
#include "igl_inline.h"
namespace igl
{
/// Construct a #F×#F adjacency matrix with A(i,j)>0 indicating that faces i and j
/// share an edge.
///
/// @param[in] F #F by 3 list of facets
/// @param[out] A #F by #F adjacency matrix
template <typename DerivedF, typename Atype>
IGL_INLINE void facet_adjacency_matrix(
const Eigen::MatrixBase<DerivedF> & F,
Eigen::SparseMatrix<Atype> & A);
};
#ifndef IGL_STATIC_LIBRARY
# include "facet_adjacency_matrix.cpp"
#endif
#endif