Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/unproject_ray.h

@@ -0,0 +1,44 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+//
+// Copyright (C) 2015 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_UNPROJECT_RAY_H
+#define IGL_UNPROJECT_RAY_H
+#include "igl_inline.h"
+#include <Eigen/Core>
+namespace igl
+{
+  // Construct a ray (source point + direction vector) given a screen space
+  // positions (e.g. mouse) and a model-view projection constellation.
+  //
+  // Inputs:
+  //   pos  2d screen-space position (x,y) 
+  //   model  4x4 model-view matrix
+  //   proj  4x4 projection matrix
+  //   viewport  4-long viewport vector
+  // Outputs:
+  //   s  source of ray (pos unprojected with z=0)
+  ///  dir  direction of ray (d - s) where d is pos unprojected with z=1
+  // 
+  template <
+    typename Derivedpos,
+    typename Derivedmodel,
+    typename Derivedproj,
+    typename Derivedviewport,
+    typename Deriveds,
+    typename Deriveddir>
+  IGL_INLINE void unproject_ray(
+    const Eigen::PlainObjectBase<Derivedpos> & pos,
+    const Eigen::PlainObjectBase<Derivedmodel> & model,
+    const Eigen::PlainObjectBase<Derivedproj> & proj,
+    const Eigen::PlainObjectBase<Derivedviewport> & viewport,
+    Eigen::PlainObjectBase<Deriveds> & s,
+    Eigen::PlainObjectBase<Deriveddir> & dir);
+}
+#ifndef IGL_STATIC_LIBRARY
+#  include "unproject_ray.cpp"
+#endif
+#endif