Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/vector_area_matrix.h

@@ -0,0 +1,41 @@
+// 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_VECTOR_AREA_MATRIX_H
+#define IGL_VECTOR_AREA_MATRIX_H
+#include "igl_inline.h"
+
+#include <Eigen/Dense>
+#include <Eigen/Sparse>
+
+namespace igl
+{
+  // Constructs the symmetric area matrix A, s.t.  [V.col(0)' V.col(1)'] * A *
+  // [V.col(0); V.col(1)] is the **vector area** of the 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:
+  //   F  #F by 3 list of mesh faces (must be triangles)
+  // Outputs:
+  //   A  #Vx2 by #Vx2 area matrix
+  //
+  template <typename DerivedF, typename Scalar>
+  IGL_INLINE void vector_area_matrix(
+    const Eigen::PlainObjectBase<DerivedF> & F,
+    Eigen::SparseMatrix<Scalar>& A);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "vector_area_matrix.cpp"
+#endif
+
+#endif