Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/squared_edge_lengths.h

@@ -0,0 +1,49 @@
+// 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_SQUARED_EDGE_LENGTHS_H
+#define IGL_SQUARED_EDGE_LENGTHS_H
+#include "igl_inline.h"
+
+#include <Eigen/Dense>
+
+namespace igl
+{
+  // Constructs a list of squared lengths of edges opposite each index in a face
+  // (triangle/tet) list
+  //
+  // Templates:
+  //   DerivedV derived from vertex positions matrix type: i.e. MatrixXd
+  //   DerivedF derived from face indices matrix type: i.e. MatrixXi
+  //   DerivedL derived from edge lengths matrix type: i.e. MatrixXd
+  // Inputs:
+  //   V  eigen matrix #V by 3
+  //   F  #F by 2 list of mesh edges
+  //    or
+  //   F  #F by 3 list of mesh faces (must be triangles)
+  //    or
+  //   T  #T by 4 list of mesh elements (must be tets)
+  // Outputs:
+  //   L  #F by {1|3|6} list of edge lengths squared
+  //     for edges, column of lengths
+  //     for triangles, columns correspond to edges [1,2],[2,0],[0,1]
+  //     for tets, columns correspond to edges
+  //     [3 0],[3 1],[3 2],[1 2],[2 0],[0 1]
+  //
+  template <typename DerivedV, typename DerivedF, typename DerivedL>
+  IGL_INLINE void squared_edge_lengths(
+    const Eigen::MatrixBase<DerivedV>& V,
+    const Eigen::MatrixBase<DerivedF>& F,
+    Eigen::PlainObjectBase<DerivedL>& L);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "squared_edge_lengths.cpp"
+#endif
+
+#endif
+