Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/rotation_matrix_from_directions.h

@@ -0,0 +1,34 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+//
+// Copyright (C) 2016 Alec Jacobson, Daniele Panozzo, Olga Diamanti 
+//
+// 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_ROTATION_MATRIX_FROM_DIRECTIONS_H
+#define IGL_ROTATION_MATRIX_FROM_DIRECTIONS_H
+#include "igl_inline.h"
+
+#include <Eigen/Core>
+
+namespace igl 
+{
+  // Given 2 vectors centered on origin calculate the rotation matrix from
+  // first to the second
+  //
+  // Inputs:
+  //   v0  3D column vector
+  //   v1  3D column vector
+  // Output:
+  //   3 by 3 rotation matrix that takes v0 to v1
+  //
+  template <typename Scalar>
+  IGL_INLINE Eigen::Matrix<Scalar, 3, 3> rotation_matrix_from_directions(
+    const Eigen::Matrix<Scalar, 3, 1> v0,
+    const Eigen::Matrix<Scalar, 3, 1> v1);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#include "rotation_matrix_from_directions.cpp"
+#endif
+#endif