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// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2013 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_MASSMATRIX_TYPE_H
#define IGL_MASSMATRIX_TYPE_H
#include "igl_inline.h"
#define EIGEN_YES_I_KNOW_SPARSE_MODULE_IS_NOT_STABLE_YET
#include <Eigen/Dense>
#include <Eigen/Sparse>
namespace igl
{
enum MassMatrixType
{
MASSMATRIX_TYPE_BARYCENTRIC = 0,
MASSMATRIX_TYPE_VORONOI = 1,
MASSMATRIX_TYPE_FULL = 2,
MASSMATRIX_TYPE_DEFAULT = 3,
NUM_MASSMATRIX_TYPE = 4
};
// Constructs the mass (area) matrix for a given mesh (V,F).
//
// Templates:
// DerivedV derived type of eigen matrix for V (e.g. derived from
// MatrixXd)
// DerivedF derived type of eigen matrix for F (e.g. derived from
// MatrixXi)
// Scalar scalar type for eigen sparse matrix (e.g. double)
// Inputs:
// V #V by dim list of mesh vertex positions
// F #F by simplex_size list of mesh faces (must be triangles)
// type one of the following ints:
// MASSMATRIX_TYPE_BARYCENTRIC barycentric
// MASSMATRIX_TYPE_VORONOI voronoi-hybrid {default}
// MASSMATRIX_TYPE_FULL full {not implemented}
// Outputs:
// M #V by #V mass matrix
//
// See also: adjacency_matrix
//
template <typename DerivedV, typename DerivedF, typename Scalar>
IGL_INLINE void massmatrix(
const Eigen::MatrixBase<DerivedV> & V,
const Eigen::MatrixBase<DerivedF> & F,
const MassMatrixType type,
Eigen::SparseMatrix<Scalar>& M);
}
#ifndef IGL_STATIC_LIBRARY
# include "massmatrix.cpp"
#endif
#endif
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