Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/ray_sphere_intersect.h

@@ -0,0 +1,46 @@
+// 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_RAY_SPHERE_INTERSECT_H
+#define IGL_RAY_SPHERE_INTERSECT_H
+#include "igl_inline.h"
+#include <Eigen/Core>
+namespace igl
+{
+  // Compute the intersection between a ray from O in direction D and a sphere
+  // centered at C with radius r
+  //
+  // Inputs:
+  //   o  origin of ray
+  //   d  direction of ray
+  //   c  center of sphere
+  //   r  radius of sphere
+  // Outputs:
+  //   t0  parameterization of first hit (set only if exists) so that hit
+  //    position = o + t0*d
+  //   t1  parameterization of second hit (set only if exists)
+  //   
+  // Returns the number of hits
+  template <
+    typename Derivedo,
+    typename Derivedd,
+    typename Derivedc, 
+    typename r_type, 
+    typename t_type>
+  IGL_INLINE int ray_sphere_intersect(
+    const Eigen::PlainObjectBase<Derivedo> & o,
+    const Eigen::PlainObjectBase<Derivedd> & d,
+    const Eigen::PlainObjectBase<Derivedc> & c,
+    r_type r, 
+    t_type & t0,
+    t_type & t1);
+}
+#ifndef IGL_STATIC_LIBRARY
+#include "ray_sphere_intersect.cpp"
+#endif
+#endif
+