Add output operator for rays

src/pe/raytracing/Ray.cpp

+//======================================================================================================================
+//
+//  This file is part of waLBerla. waLBerla is free software: you can
+//  redistribute it and/or modify it under the terms of the GNU General Public
+//  License as published by the Free Software Foundation, either version 3 of
+//  the License, or (at your option) any later version.
+//
+//  waLBerla is distributed in the hope that it will be useful, but WITHOUT
+//  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+//  for more details.
+//
+//  You should have received a copy of the GNU General Public License along
+//  with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file Ray.h
+//! \author Lukas Werner
+//
+//======================================================================================================================
+
+#include <pe/raytracing/Ray.h>
+
+namespace walberla {
+namespace pe {
+namespace raytracing {
+/*!\brief Global output operator for rays.
+ *
+ * \param os Reference to the output stream.
+ * \param ray Reference to a constant ray object.
+ * \return Reference to the output stream.
+ */
+std::ostream& operator<<(std::ostream& os, const Ray& ray) {
+   return os << "<o: " << ray.getOrigin()
+   << ", d: " << ray.getDirection()
+   << ", c: (" << ray.getImageX() << "/" << ray.getImageY() << ")>";
+}
+
+}
+}
+}