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34 lines
1.3 KiB
34 lines
1.3 KiB
1 year ago
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// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2023 Alec Jacobson
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#include "lscm_hessian.h"
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#include "vector_area_matrix.h"
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#include "cotmatrix.h"
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#include "repdiag.h"
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template <typename DerivedV, typename DerivedF, typename QScalar>
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void igl::lscm_hessian(
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const Eigen::MatrixBase<DerivedV> & V,
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const Eigen::MatrixBase<DerivedF> & F,
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Eigen::SparseMatrix<QScalar> & Q)
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{
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// Assemble the area matrix (note that A is #Vx2 by #Vx2)
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Eigen::SparseMatrix<QScalar> A;
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igl::vector_area_matrix(F,A);
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// Assemble the cotan laplacian matrix
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Eigen::SparseMatrix<QScalar> L;
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igl::cotmatrix(V,F,L);
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Eigen::SparseMatrix<QScalar> L_flat;
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igl::repdiag(L,2,L_flat);
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Q = -L_flat - 2.*A;
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiation
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// generated by autoexplicit.sh
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template void igl::lscm_hessian<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1>, double>(Eigen::MatrixBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::MatrixBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::SparseMatrix<double, 0, int>&);
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#endif
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