libigl_Martin/include/igl/is_manifold.cpp

// This file is part of libigl, a simple c++ geometry processing library.
// 
// Copyright (C) 2013 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 "is_manifold.h"

#include <algorithm>

template <typename DerivedV, typename DerivedF>
IGL_INLINE bool igl::is_manifold(const Eigen::PlainObjectBase<DerivedV>& /*V*/,
                                 const Eigen::PlainObjectBase<DerivedF>& F)
  {
    std::vector<std::vector<int> > TTT;
    for(int f=0;f<F.rows();++f)
      for (int i=0;i<3;++i)
      {
        // v1 v2 f ei 
        int v1 = F(f,i);
        int v2 = F(f,(i+1)%3);
        if (v1 > v2) std::swap(v1,v2);
        std::vector<int> r(4);
        r[0] = v1; r[1] = v2;
        r[2] = f;  r[3] = i;
        TTT.push_back(r);
      }
    std::sort(TTT.begin(),TTT.end());
    
    for(int i=2;i<(int)TTT.size();++i)
    {
      std::vector<int>& r1 = TTT[i-2];
      std::vector<int>& r2 = TTT[i-1];
      std::vector<int>& r3 = TTT[i];
      if ( (r1[0] == r2[0] && r2[0] == r3[0]) 
          && 
          (r1[1] == r2[1] && r2[1] == r3[1]) )
      {
        return false;
      }
    }
    return true;
  }

#ifndef IGL_HEADER_ONLY
// Explicit template specialization
// generated by autoexplicit.sh
template bool igl::is_manifold<Eigen::Matrix<float, -1, 3, 1, -1, 3>, Eigen::Matrix<unsigned int, -1, -1, 1, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<float, -1, 3, 1, -1, 3> > const&, Eigen::PlainObjectBase<Eigen::Matrix<unsigned int, -1, -1, 1, -1, -1> > const&);
// generated by autoexplicit.sh
//template bool igl::is_manifold<double>(Eigen::Matrix<double, -1, -1, 0, -1, -1> const&, Eigen::Matrix<int, -1, -1, 0, -1, -1> const&);
template bool igl::is_manifold<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&);
#endif