Changes from PR

LibCarla/source/carla/nav/Navigation.cpp

@@ -602,7 +602,7 @@ namespace nav {
 
   // get a random location for navigation
   bool Navigation::GetRandomLocation(carla::geom::Location &location, float maxHeight, dtQueryFilter * filter,
-  bool use_lock) {
+  bool use_lock) const {
 
     std::unique_lock<std::mutex> guard(_mutex, std::defer_lock);
 

LibCarla/source/carla/nav/Navigation.h

@@ -59,7 +59,7 @@ namespace nav {
     void UpdateCrowd(const client::detail::EpisodeState &state);
     /// get a random location for navigation
     bool GetRandomLocation(carla::geom::Location &location, float maxHeight = -1.0f,
-    dtQueryFilter * filter = nullptr, bool use_lock = true);
+    dtQueryFilter * filter = nullptr, bool use_lock = true) const;
 
   private:
 
@@ -76,7 +76,7 @@ namespace nav {
     /// Store walkers yaw angle from previous tick
     std::unordered_map<ActorId, float> _yaw_walkers;
 
-    std::mutex _mutex;
+    mutable std::mutex _mutex;
 
   };
 

PythonAPI/examples/spawn_npc.py

@@ -166,6 +166,10 @@ def main():
             all_id.append(walkers_list[i]["con"])
             all_id.append(walkers_list[i]["id"])
         all_actors = world.get_actors(all_id)
+
+        # wait for a tick to ensure client receives the last transform of the walkers we have just created
+        world.wait_for_tick()
+
         # 5. initialize each controller and set target to walk to (list is [controler, actor, controller, actor ...])
         for i in range(0, len(all_id), 2):
             # start walker

Unreal/CarlaUE4/Plugins/Carla/Source/Carla/Server/CarlaServer.cpp

@@ -617,7 +617,7 @@ void FCarlaServer::FPimpl::BindActions()
     auto ActorView = Episode->FindActor(ActorId);
     if (!ActorView.IsValid())
     {
-      RESPOND_ERROR("unable to apply control: actor view is invalid");
+      RESPOND_ERROR("unable to apply control: actor not found");
     }
     auto Pawn = Cast<APawn>(ActorView.GetActor());
     if (Pawn == nullptr)