elem_cutter.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2025 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



#ifndef LIBMESH_ELEM_CUTTER_H
#define LIBMESH_ELEM_CUTTER_H

#include "libmesh/libmesh_config.h"

#if defined(LIBMESH_HAVE_TRIANGLE) && defined(LIBMESH_HAVE_TETGEN)

// libMesh includes
#include "libmesh/libmesh_common.h"
#include "libmesh/point.h"

// TIMPI includes
#include "timpi/communicator.h"

// C++ includes
#include <vector>
#include <memory>

namespace libMesh
{

// Forward declarations
class Elem;
class ReplicatedMesh;
class TriangleInterface;
class TetGenMeshInterface;

// This is for backwards compatibility, but if your code relies on
// forward declarations in our headers then fix it.
class SerialMesh;

class ElemCutter
{
public:

  ElemCutter();

  ~ElemCutter();

  bool is_inside (const Elem & elem,
                  const std::vector<Real> & vertex_distance_func) const;

  bool is_outside (const Elem & elem,
                   const std::vector<Real> & vertex_distance_func) const;

  bool is_cut (const Elem & elem,
               const std::vector<Real> & vertex_distance_func) const;

  void operator()(const Elem & elem_in,
                  const std::vector<Real> & vertex_distance_func);

  const std::vector<Elem const *> & inside_elements () const
  { return _inside_elem; }

  const std::vector<Elem const *> & outside_elements() const
  { return _outside_elem; }

protected:

  void find_intersection_points(const Elem & elem,
                                const std::vector<Real> & vertex_distance_func);

  void cut_1D(const Elem & elem,
              const std::vector<Real> & vertex_distance_func);

  void cut_2D(const Elem & elem,
              const std::vector<Real> & vertex_distance_func);

  void cut_3D(const Elem & elem,
              const std::vector<Real> & vertex_distance_func);

  std::vector<Elem const *> _inside_elem;
  std::vector<Elem const *> _outside_elem;

  Parallel::Communicator _comm_self; // defaults to MPI_COMM_SELF

  std::unique_ptr<ReplicatedMesh> _inside_mesh_2D;
  std::unique_ptr<TriangleInterface> _triangle_inside;

  std::unique_ptr<ReplicatedMesh> _outside_mesh_2D;
  std::unique_ptr<TriangleInterface> _triangle_outside;

  std::unique_ptr<ReplicatedMesh> _inside_mesh_3D;
  std::unique_ptr<TetGenMeshInterface> _tetgen_inside;

  std::unique_ptr<ReplicatedMesh> _outside_mesh_3D;
  std::unique_ptr<TetGenMeshInterface> _tetgen_outside;

  std::vector<Point> _intersection_pts;
};


} // namespace libMesh

#endif // LIBMESH_HAVE_TRIANGLE && LIBMESH_HAVE_TETGEN
#endif // LIBMESH_ELEM_CUTTER_H