// This file is part of libigl, a simple c++ geometry processing library.
// 
// Copyright (C) 2015 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/.
#ifndef IGL_PLANARIZE_QUAD_MESH_H
#define IGL_PLANARIZE_QUAD_MESH_H
#include "igl_inline.h"
#include <Eigen/Core>
namespace igl
{
  /// Planarizes a given quad mesh using the algorithm described in the paper
  /// "Shape-Up: Shaping Discrete Geometry with Projections" by S. Bouaziz,
  /// M. Deuss, Y. Schwartzburg, T. Weise, M. Pauly, Computer Graphics Forum,
  /// Volume 31, Issue 5, August 2012, p. 1657-1667
  /// (http://dl.acm.org/citation.cfm?id=2346802).
  /// The algorithm iterates between projecting each quad to its closest planar
  /// counterpart and stitching those quads together via a least squares
  /// optimization. It stops whenever all quads' non-planarity is less than a
  /// given threshold (suggested value: 0.01), or a maximum number of iterations
  /// is reached.
  ///
  /// @param[in] Vin        #V by 3 eigen Matrix of mesh vertex 3D positions
  /// @param[in] F          #F by 4 eigen Matrix of face (quad) indices
  /// @param[in] maxIter    maximum numbers of iterations
  /// @param[in] threshold  minimum allowed threshold for non-planarity
  /// @param[out] Vout       #V by 3 eigen Matrix of planar mesh vertex 3D positions
  ///
  template <typename DerivedV, typename DerivedF>
  IGL_INLINE void planarize_quad_mesh(
    const Eigen::MatrixBase<DerivedV> &Vin,
    const Eigen::MatrixBase<DerivedF> &F,
    const int maxIter,
    const double &threshold,
    Eigen::PlainObjectBase<DerivedV> &Vout);
}
#ifndef IGL_STATIC_LIBRARY
#  include "planarize_quad_mesh.cpp"
#endif

#endif