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39 lines
1.3 KiB
39 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) 2018 Alec Jacobson <alecjacobson@gmail.com>
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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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#ifndef IGL_COTMATRIX_INTRINSIC_H
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#define IGL_COTMATRIX_INTRINSIC_H
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#include "igl_inline.h"
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#include <Eigen/Dense>
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#include <Eigen/Sparse>
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namespace igl
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{
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/// Constructs the cotangent stiffness matrix (discrete laplacian) for a given
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/// mesh with faces F and edge lengths l.
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///
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/// @param[in] l #F by 3 list of (half-)edge lengths
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/// @param[in] F #F by 3 list of face indices into some (not necessarily
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/// determined/embedable) list of vertex positions V. It is assumed #V ==
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/// F.maxCoeff()+1
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/// @param[out] L #V by #V sparse Laplacian matrix
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///
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/// \see cotmatrix, intrinsic_delaunay_cotmatrix
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template <typename Derivedl, typename DerivedF, typename Scalar>
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IGL_INLINE void cotmatrix_intrinsic(
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const Eigen::MatrixBase<Derivedl> & l,
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const Eigen::MatrixBase<DerivedF> & F,
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Eigen::SparseMatrix<Scalar>& L);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "cotmatrix_intrinsic.cpp"
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#endif
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#endif
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