Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/edge_topology.h

@@ -0,0 +1,50 @@
+// 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_EDGE_TOPOLOGY_H
+#define IGL_EDGE_TOPOLOGY_H
+
+#include "igl_inline.h"
+
+#include <Eigen/Core>
+#include <vector>
+
+namespace igl 
+{
+  // Initialize Edges and their topological relations (assumes an edge-manifold
+  // mesh)
+  //
+  // Inputs:
+  //   V  #V by dim list of mesh vertex positions (unused)
+  //   F  #F by 3 list of triangle indices into V
+  // Outputs:
+  //   EV  #Ex2 matrix storing the edge description as pair of indices to
+  //       vertices
+  //   FE  #Fx3 matrix storing the Triangle-Edge relation
+  //   EF  #Ex2 matrix storing the Edge-Triangle relation
+  //
+  // TODO: This seems to be a inferior duplicate of edge_flaps.h:
+  //   - unused input parameter V
+  //   - roughly 2x slower than edge_flaps
+  //   - outputs less information: edge_flaps reveals corner opposite edge
+  //   - FE uses non-standard and ambiguous order: FE(f,c) is merely an edge
+  //     incident on corner c of face f. In contrast, edge_flaps's EMAP(f,c)
+  //     reveals the edge _opposite_ corner c of face f
+template <typename DerivedV, typename DerivedF>
+  IGL_INLINE void edge_topology(
+    const Eigen::PlainObjectBase<DerivedV>& V,
+    const Eigen::PlainObjectBase<DerivedF>& F, 
+    Eigen::MatrixXi& EV, 
+    Eigen::MatrixXi& FE, 
+    Eigen::MatrixXi& EF);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "edge_topology.cpp"
+#endif
+
+#endif