// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2020 Oded Stein <oded.stein@columbia.edu>
//
// 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_ORIENT_HALFEDGES_H
#define IGL_ORIENT_HALFEDGES_H

#include "igl_inline.h"
#include <Eigen/Core>


namespace igl
{
  // Orients halfedges for a triangle mesh, assigning them to a unique edge.
  //
  // Inputs:
  //  F: input mesh connectivity
  //
  // Outputs:
  //  E: a mapping from each halfedge to each edge
  //  oE: the orientation of each halfedge compared to the orientation of the
  //      actual edge. Every edge appears positively oriented exactly once.

  template <typename DerivedF, typename DerivedE, typename DerivedOE>
  IGL_INLINE void
  orient_halfedges(
    const Eigen::MatrixBase<DerivedF>& F,
    Eigen::PlainObjectBase<DerivedE>& E,
    Eigen::PlainObjectBase<DerivedOE>& oE);

}


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

#endif