Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/shortest_edge_and_midpoint.h

@@ -0,0 +1,48 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2016 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_SHORTEST_EDGE_AND_MIDPOINT_H
+#define IGL_SHORTEST_EDGE_AND_MIDPOINT_H
+#include "igl_inline.h"
+#include <Eigen/Core>
+#include <vector>
+namespace igl
+{
+  // Cost and placement function compatible with igl::decimate. The cost of
+  // collapsing an edge is its length (prefer to collapse short edges) and the
+  // placement strategy for the new vertex is the midpoint of the collapsed
+  // edge.
+  //
+  // Inputs:
+  //   e  index into E of edge to be considered for collapse
+  //   V  #V by dim list of vertex positions
+  //   F  #F by 3 list of faces (ignored)
+  //   E  #E by 2 list of edge indices into V
+  //   EMAP  #F*3 list of half-edges indices into E (ignored)
+  //   EF  #E by 2 list of edge-face flaps into F (ignored)
+  //   EI  #E by 2 list of edge-face opposite corners (ignored)
+  // Outputs:
+  //   cost  set to edge length
+  //   p  placed point set to edge midpoint
+  IGL_INLINE void shortest_edge_and_midpoint(
+    const int e,
+    const Eigen::MatrixXd & V,
+    const Eigen::MatrixXi & /*F*/,
+    const Eigen::MatrixXi & E,
+    const Eigen::VectorXi & /*EMAP*/,
+    const Eigen::MatrixXi & /*EF*/,
+    const Eigen::MatrixXi & /*EI*/,
+    double & cost,
+    Eigen::RowVectorXd & p);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "shortest_edge_and_midpoint.cpp"
+#endif
+#endif
+
+