74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
|
|
//
|
|
// Copyright (C) 2018 Oded Stein <oded.stein@columbia.edu>
|
|
//
|
|
// 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 "tet_tet_adjacency.h"
|
|
|
|
#include "parallel_for.h"
|
|
|
|
#include <array>
|
|
#include <vector>
|
|
|
|
template <typename DerivedT, typename DerivedTT, typename DerivedTTi>
|
|
IGL_INLINE void
|
|
igl::tet_tet_adjacency(
|
|
const Eigen::MatrixBase<DerivedT>& T,
|
|
Eigen::PlainObjectBase<DerivedTT>& TT,
|
|
Eigen::PlainObjectBase<DerivedTTi>& TTi)
|
|
{
|
|
assert(T.cols()==4 && "Tets have four vertices.");
|
|
|
|
//Preprocess
|
|
using Array = std::array<typename DerivedT::Scalar, 5>;
|
|
std::vector<Array> TTT(4*T.rows());
|
|
const auto loop_f = [&](const int t) {
|
|
TTT[4*t] = {T(t,0),T(t,1),T(t,2),t,0};
|
|
TTT[4*t+1] = {T(t,0),T(t,1),T(t,3),t,1};
|
|
TTT[4*t+2] = {T(t,1),T(t,2),T(t,3),t,2};
|
|
TTT[4*t+3] = {T(t,2),T(t,0),T(t,3),t,3};
|
|
for(int i=0; i<4; ++i)
|
|
std::sort(TTT[4*t+i].begin(), TTT[4*t+i].begin()+3);
|
|
};
|
|
|
|
//for(int t=0; t<T.rows(); ++t)
|
|
// loop_f(t);
|
|
igl::parallel_for(T.rows(), loop_f);
|
|
|
|
std::sort(TTT.begin(),TTT.end());
|
|
|
|
//Compute TT and TTi
|
|
TT.setConstant(T.rows(), T.cols(), -1);
|
|
TTi.setConstant(T.rows(), T.cols(), -1);
|
|
for(int i=1; i<TTT.size(); ++i) {
|
|
const Array& r1 = TTT[i-1];
|
|
const Array& r2 = TTT[i];
|
|
if((r1[0]==r2[0]) && (r1[1]==r2[1]) && (r1[2]==r2[2])) {
|
|
TT(r1[3],r1[4]) = r2[3];
|
|
TT(r2[3],r2[4]) = r1[3];
|
|
TTi(r1[3],r1[4]) = r2[4];
|
|
TTi(r2[3],r2[4]) = r1[4];
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
template <typename DerivedT, typename DerivedTT>
|
|
IGL_INLINE void
|
|
igl::tet_tet_adjacency(
|
|
const Eigen::MatrixBase<DerivedT>& T,
|
|
Eigen::PlainObjectBase<DerivedTT>& TT)
|
|
{
|
|
DerivedTT TTi;
|
|
tet_tet_adjacency(T, TT, TTi);
|
|
}
|
|
|
|
#ifdef IGL_STATIC_LIBRARY
|
|
template void igl::tet_tet_adjacency<Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1> >(Eigen::MatrixBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&);
|
|
#endif
|
|
|