libigl/include/igl/internal_angles.h

// This file is part of libigl, a simple c++ geometry processing library.
// 
// Copyright (C) 2015 Alec Jacobson <[email protected]>
// 
// 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_INTERNAL_ANGLES_H
#define IGL_INTERNAL_ANGLES_H
#include "igl_inline.h"
#include <Eigen/Core>
namespace igl
{
  /// Compute internal angles for a triangle mesh
  ///
  /// @param[in] V  #V by dim eigen Matrix of mesh vertex nD positions
  /// @param[in] F  #F by poly-size eigen Matrix of face (triangle) indices
  /// @param[out] K  #F by poly-size eigen Matrix of internal angles
  ///     for triangles, columns correspond to edges [1,2],[2,0],[0,1]
  ///
  /// \note if poly-size ≠ 3 then dim must equal 3.
  template <typename DerivedV, typename DerivedF, typename DerivedK>
  IGL_INLINE void internal_angles(
    const Eigen::MatrixBase<DerivedV>& V,
    const Eigen::MatrixBase<DerivedF>& F,
    Eigen::PlainObjectBase<DerivedK> & K);
  /// \overload
  ///
  /// @param[in] L_sq  #F by 3 list of squared edge lengths
  /// @param[out] K  #F by poly-size eigen Matrix of internal angles
  ///     for triangles, columns correspond to edges [1,2],[2,0],[0,1]
  ///
  /// \fileinfo
  template <typename DerivedL, typename DerivedK>
  IGL_INLINE void internal_angles_using_squared_edge_lengths(
    const Eigen::MatrixBase<DerivedL>& L_sq,
    Eigen::PlainObjectBase<DerivedK> & K);
}

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

#endif