Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/massmatrix.h

@@ -0,0 +1,61 @@
+// 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
+