closest_surface_point.h

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// -----------------------------------------------------------------------------
//
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
// Copyright (C) 2025 - 2026 by the deal.II authors
//
// This file is part of the deal.II library.
//
// Detailed license information governing the source code and contributions
// can be found in LICENSE.md and CONTRIBUTING.md at the top level directory.
//
// -----------------------------------------------------------------------------
 
#ifndef dealii_non_matching_closest_surface_point_h
#define dealii_non_matching_closest_surface_point_h
 
#include <deal.II/base/config.h>
 
#include <deal.II/base/point.h>
 
#include <deal.II/dofs/dof_handler.h>
 
#include <deal.II/fe/fe.h>
#include <deal.II/fe/mapping.h>
 
#include <deal.II/lac/read_vector.h>
 
DEAL_II_NAMESPACE_OPEN
 
namespace NonMatching
{
  template <int dim, class Number>
  class ClosestSurfacePoint : public EnableObserverPointer
  {
  public:
    struct AdditionalData
    {
      unsigned int level = numbers::invalid_unsigned_int;
      double tolerance = 1e-10;
      unsigned int n_iterations = 20;
    };
    ClosestSurfacePoint(const ReadVector<Number> &level_set,
                        const DoFHandler<dim>    &dof_handler,
                        Mapping<dim>             &mapping,
                        const AdditionalData     &data = AdditionalData());
 
 
 
    std::pair<std::vector<Point<dim>>, std::vector<Point<dim>>>
    compute_closest_surface_points(
      const typename Triangulation<dim>::cell_iterator &search_cell,
      const typename Triangulation<dim>::cell_iterator &reference_cell,
      const std::vector<Point<dim>> &quadrature_points) const;
 
  private:
    AdditionalData                            data;
    ObserverPointer<const DoFHandler<dim>>    dof_handler;
    ObserverPointer<const ReadVector<Number>> level_set;
    ObserverPointer<Mapping<dim>>             mapping;
 
 
 
    void
    newton_monolithic(const Point<dim>          &point,
                      const FiniteElement<dim>  &fe,
                      const std::vector<Number> &dof_values,
                      Point<dim>                &closest_point) const;
  };
 
 
 
} // namespace NonMatching
DEAL_II_NAMESPACE_CLOSE
 
#endif