Update examples/CMakeLists for Ray examples

Author: pockerman

examples/CMakeLists.txt

@@ -24,6 +24,11 @@ IF(RLENVSCPP_WEBOTS)
 	LINK_DIRECTORIES(${WEBOTS_LIB_DIRS})
 ENDIF()
 
+IF(RLENVSCPP_RAY)
+	INCLUDE_DIRECTORIES(${RAY_INCLUDE_DIRS})
+	LINK_DIRECTORIES(${RAY_LIB_DIRS})
+ENDIF()
+
 LINK_DIRECTORIES(${CMAKE_INSTALL_PREFIX})
 MESSAGE( STATUS  "${CMAKE_INSTALL_PREFIX}")
 
@@ -44,3 +49,7 @@ ADD_SUBDIRECTORY(example_13)
 IF(RLENVSCPP_WEBOTS)
 	ADD_SUBDIRECTORY(webots/world_1)
 ENDIF()
+
+IF(RLENVSCPP_RAY)
+	ADD_SUBDIRECTORY(ray/ray_example_2)
+ENDIF()

src/rlenvs/envs/webots_envs/epuck_simple_grid_world.h

@@ -37,6 +37,7 @@ using namespace rlenvscpp::rigid_bodies::webots_robots;
 /// "WEBOTS_HOME/projects/robots/gctronic/e-puck/protos/E-puck.proto"
 /// The environment returns the robot translation as an observation
 /// i.e. the (x,y,z) coordinates of the robot position
+/// The maximum reward the robot can achieve
 ///
 class EpuckSimpleGridWorld final: public WebotsEnvBase<TimeStep<std::vector<real_t>>, 
                                                        ContinuousVectorStateDiscreteActionEnv<3, // the state space has size 3