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90 lines
2.8 KiB
90 lines
2.8 KiB
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2020 Oded Stein <oded.stein@columbia.edu>
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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 "cr_vector_mass.h"
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#include <vector>
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#include "orient_halfedges.h"
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#include "doublearea.h"
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#include "squared_edge_lengths.h"
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template <typename DerivedV, typename DerivedF, typename DerivedE, typename ScalarM>
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IGL_INLINE void
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igl::cr_vector_mass(
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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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Eigen::SparseMatrix<ScalarM>& M)
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{
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Eigen::Matrix<typename DerivedV::Scalar, Eigen::Dynamic, Eigen::Dynamic>
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dblA;
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doublearea(V,F,dblA);
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cr_vector_mass_intrinsic(F, dblA, E, M);
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}
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template <
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typename DerivedV,
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typename DerivedF,
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typename DerivedE,
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typename ScalarM>
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IGL_INLINE void
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igl::cr_vector_mass(
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const Eigen::MatrixBase<DerivedV>& V,
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const Eigen::MatrixBase<DerivedF>& F,
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Eigen::PlainObjectBase<DerivedE>& E,
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Eigen::SparseMatrix<ScalarM>& M)
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{
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if(E.rows()!=F.rows() || E.cols()!=F.cols())
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{
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DerivedE oE;
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orient_halfedges(F, E, oE);
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}
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const Eigen::PlainObjectBase<DerivedE>& cE = E;
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cr_vector_mass(V, F, cE, M);
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}
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template <typename DerivedF, typename DeriveddA,
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typename DerivedE, typename ScalarM>
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IGL_INLINE void
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igl::cr_vector_mass_intrinsic(
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const Eigen::MatrixBase<DerivedF>& F,
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const Eigen::MatrixBase<DeriveddA>& dA,
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const Eigen::MatrixBase<DerivedE>& E,
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Eigen::SparseMatrix<ScalarM>& M)
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{
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assert(F.cols()==3 && "Faces have three vertices");
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assert(E.rows()==F.rows() && E.cols()==F.cols() && "Wrong dimension in edge vectors");
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const Eigen::Index m = F.rows();
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const typename DerivedE::Scalar nE = E.maxCoeff() + 1;
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std::vector<Eigen::Triplet<ScalarM> > tripletList;
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tripletList.reserve(2*3*m);
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for(Eigen::Index f=0; f<m; ++f) {
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for(int e=0; e<3; ++e) {
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//Scaled
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const ScalarM entry = dA(f) / 6;
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tripletList.emplace_back(E(f,e), E(f,e), entry);
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tripletList.emplace_back(E(f,e)+nE, E(f,e)+nE, entry);
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}
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}
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M.resize(2*nE, 2*nE);
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M.setFromTriplets(tripletList.begin(), tripletList.end());
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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::cr_vector_mass<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -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::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1>>&, Eigen::SparseMatrix<double, 0, int>&);
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#endif
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