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Merged branch 'dev_native' into lm_sla_supports_auto

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Added igl library files
This commit is contained in:
Lukas Matena 2018-10-26 15:45:52 +02:00
commit 7681d00ee5
2865 changed files with 142806 additions and 22325 deletions
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src/igl/crouzeix_raviart_cotmatrix.cpp Normal file
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// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2017 Alec Jacobson <alecjacobson@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public License
// v. 2.0. If a copy of the MPL was not distributed with this file, You can
// obtain one at http://mozilla.org/MPL/2.0/.
#include "crouzeix_raviart_cotmatrix.h"
#include "unique_simplices.h"
#include "oriented_facets.h"
#include "is_edge_manifold.h"
#include "cotmatrix_entries.h"
template <typename DerivedV, typename DerivedF, typename LT, typename DerivedE, typename DerivedEMAP>
void igl::crouzeix_raviart_cotmatrix(
const Eigen::MatrixBase<DerivedV> & V,
const Eigen::MatrixBase<DerivedF> & F,
Eigen::SparseMatrix<LT> & L,
Eigen::PlainObjectBase<DerivedE> & E,
Eigen::PlainObjectBase<DerivedEMAP> & EMAP)
{
// All occurrences of directed "facets"
Eigen::MatrixXi allE;
oriented_facets(F,allE);
Eigen::VectorXi _1;
unique_simplices(allE,E,_1,EMAP);
return crouzeix_raviart_cotmatrix(V,F,E,EMAP,L);
}
template <typename DerivedV, typename DerivedF, typename DerivedE, typename DerivedEMAP, typename LT>
void igl::crouzeix_raviart_cotmatrix(
const Eigen::MatrixBase<DerivedV> & V,
const Eigen::MatrixBase<DerivedF> & F,
const Eigen::MatrixBase<DerivedE> & E,
const Eigen::MatrixBase<DerivedEMAP> & EMAP,
Eigen::SparseMatrix<LT> & L)
{
// number of rows
const int m = F.rows();
// Element simplex size
const int ss = F.cols();
// Mesh should be edge-manifold
assert(F.cols() != 3 || is_edge_manifold(F));
typedef Eigen::Matrix<LT,Eigen::Dynamic,Eigen::Dynamic> MatrixXS;
MatrixXS C;
cotmatrix_entries(V,F,C);
Eigen::MatrixXi F2E(m,ss);
{
int k =0;
for(int c = 0;c<ss;c++)
{
for(int f = 0;f<m;f++)
{
F2E(f,c) = k++;
}
}
}
// number of entries inserted per facet
const int k = ss*(ss-1)*2;
std::vector<Eigen::Triplet<LT> > LIJV;LIJV.reserve(k*m);
Eigen::VectorXi LI(k),LJ(k),LV(k);
// Compensation factor to match scales in matlab version
double factor = 2.0;
switch(ss)
{
default: assert(false && "unsupported simplex size");
case 3:
factor = 4.0;
LI<<0,1,2,1,2,0,0,1,2,1,2,0;
LJ<<1,2,0,0,1,2,0,1,2,1,2,0;
LV<<2,0,1,2,0,1,2,0,1,2,0,1;
break;
case 4:
factor *= -1.0;
LI<<0,3,3,3,1,2,1,0,1,2,2,0,0,3,3,3,1,2,1,0,1,2,2,0;
LJ<<1,0,1,2,2,0,0,3,3,3,1,2,0,3,3,3,1,2,1,0,1,2,2,0;
LV<<2,3,4,5,0,1,2,3,4,5,0,1,2,3,4,5,0,1,2,3,4,5,0,1;
break;
}
for(int f=0;f<m;f++)
{
for(int c = 0;c<k;c++)
{
LIJV.emplace_back(
EMAP(F2E(f,LI(c))),
EMAP(F2E(f,LJ(c))),
(c<(k/2)?-1.:1.) * factor *C(f,LV(c)));
}
}
L.resize(E.rows(),E.rows());
L.setFromTriplets(LIJV.begin(),LIJV.end());
}
#ifdef IGL_STATIC_LIBRARY
// Explicit template instantiation
// generated by autoexplicit.sh
template void igl::crouzeix_raviart_cotmatrix<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -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::MatrixBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::MatrixBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> > const&, Eigen::SparseMatrix<double, 0, int>&);
#endif