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34 lines
1.1 KiB
34 lines
1.1 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_GRAD_INTRINSIC_H
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#define IGL_GRAD_INTRINSIC_H
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#include "igl_inline.h"
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#include <Eigen/Core>
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#include <Eigen/Sparse>
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namespace igl {
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/// Construct an intrinsic gradient operator.
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///
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/// @param[in] l #F by 3 list of edge lengths
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/// @param[in] F #F by 3 list of triangle indices into some vertex list V
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/// @param[out] G #F*2 by #V gradient matrix: G=[Gx;Gy] where x runs along the 23 edge and
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/// y runs in the counter-clockwise 90° rotation.
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template <typename Derivedl, typename DerivedF, typename Gtype>
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IGL_INLINE void grad_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<Gtype> &G);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "grad_intrinsic.cpp"
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#endif
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#endif
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