// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2014 Daniele Panozzo <daniele.panozzo@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_COMISO_FRAMEFIELD_H
#define IGL_COMISO_FRAMEFIELD_H

#include "../../igl_inline.h"
#include "../../PI.h"
#include <Eigen/Dense>
#include <vector>

namespace igl
{
namespace copyleft
{
namespace comiso
{
/// Generate a piecewise-constant frame-field field from a sparse set of constraints on faces
/// using the algorithm proposed in:
/// Frame Fields: Anisotropic and Non-Orthogonal Cross Fields
/// Daniele Panozzo, Enrico Puppo, Marco Tarini, Olga Sorkine-Hornung,
/// ACM Transactions on Graphics (SIGGRAPH, 2014)
///
/// @param[in] V       #V by 3 list of mesh vertex coordinates
/// @param[in] F       #F by 3 list of mesh faces (must be triangles)
/// @param[in] b       #B by 1 list of constrained face indices
/// @param[in] bc1     #B by 3 list of the constrained first representative vector of the frame field (up to permutation and sign)
/// @param[in] bc2     #B by 3 list of the constrained second representative vector of the frame field (up to permutation and sign)
/// @param[out] FF1      #F by 3 the first representative vector of the frame field (up to permutation and sign)
/// @param[out] FF2      #F by 3 the second representative vector of the frame field (up to permutation and sign)
///
/// \note it now supports only soft constraints, should be extended to support both hard and soft constraints
IGL_INLINE void frame_field(
  const Eigen::MatrixXd& V,
  const Eigen::MatrixXi& F,
  const Eigen::VectorXi& b,
  const Eigen::MatrixXd& bc1,
  const Eigen::MatrixXd& bc2,
  Eigen::MatrixXd& FF1,
  Eigen::MatrixXd& FF2
  );
}
}
}

#ifndef IGL_STATIC_LIBRARY
#  include "frame_field.cpp"
#endif

#endif