52 lines
1.9 KiB
C++
52 lines
1.9 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2015 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 CROUZEIX_RAVIART_MASSMATRIX_H
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#define CROUZEIX_RAVIART_MASSMATRIX_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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// CROUZEIX_RAVIART_MASSMATRIX Compute the Crouzeix-Raviart mass matrix where
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// M(e,e) is just the sum of the areas of the triangles on either side of an
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// edge e.
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//
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// See for example "Discrete Quadratic Curvature Energies" [Wardetzky, Bergou,
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// Harmon, Zorin, Grinspun 2007]
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//
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// Inputs:
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// V #V by dim list of vertex positions
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// F #F by 3/4 list of triangle/tetrahedron indices
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// Outputs:
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// M #E by #E edge/face-based diagonal mass matrix
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// E #E by 2/3 list of edges/faces
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// EMAP #F*3/4 list of indices mapping allE to E
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//
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// See also: crouzeix_raviart_cotmatrix
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template <typename MT, typename DerivedV, typename DerivedF, typename DerivedE, typename DerivedEMAP>
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void crouzeix_raviart_massmatrix(
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const Eigen::MatrixBase<DerivedV> & V,
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const Eigen::MatrixBase<DerivedF> & F,
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Eigen::SparseMatrix<MT> & M,
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Eigen::PlainObjectBase<DerivedE> & E,
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Eigen::PlainObjectBase<DerivedEMAP> & EMAP);
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// wrapper if E and EMAP are already computed (better match!)
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template <typename MT, typename DerivedV, typename DerivedF, typename DerivedE, typename DerivedEMAP>
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void crouzeix_raviart_massmatrix(
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const Eigen::MatrixBase<DerivedV> & V,
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const Eigen::MatrixBase<DerivedF> & F,
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const Eigen::MatrixBase<DerivedE> & E,
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const Eigen::MatrixBase<DerivedEMAP> & EMAP,
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Eigen::SparseMatrix<MT> & M);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "crouzeix_raviart_massmatrix.cpp"
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#endif
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#endif
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