Add random seeds to config file

Resources/Example.CarlaSettings.ini

@@ -27,6 +27,9 @@ NumberOfPedestrians=15
 ; Index of the weather/lighting presets to use. If negative, the default presets
 ; of the map will be used.
 WeatherId=-1
+; Seeds for the pseudo-random number generators.
+SeedVehicles=123456789
+SeedPedestrians=123456789
 
 [CARLA/SceneCapture]
 ; Names of the scene capture cameras to attach to the player, comma-separated,

Source/Carla/Game/CarlaGameModeBase.cpp

@@ -116,6 +116,7 @@ void ACarlaGameModeBase::BeginPlay()
   // Setup other vehicles.
   if (VehicleSpawner != nullptr) {
     VehicleSpawner->SetNumberOfVehicles(CarlaSettings.NumberOfVehicles);
+    VehicleSpawner->SetSeed(CarlaSettings.SeedVehicles);
   } else {
     UE_LOG(LogCarla, Error, TEXT("Missing vehicle spawner actor!"));
   }
@@ -123,6 +124,7 @@ void ACarlaGameModeBase::BeginPlay()
   // Setup walkers.
   if (WalkerSpawner != nullptr) {
     WalkerSpawner->SetNumberOfWalkers(CarlaSettings.NumberOfPedestrians);
+    WalkerSpawner->SetSeed(CarlaSettings.SeedPedestrians);
   } else {
     UE_LOG(LogCarla, Error, TEXT("Missing walker spawner actor!"));
   }

Source/Carla/Game/CarlaSettings.cpp

@@ -92,6 +92,8 @@ static void LoadSettingsFromConfig(
   ConfigFile.GetInt(S_CARLA_LEVELSETTINGS, TEXT("NumberOfVehicles"), Settings.NumberOfVehicles);
   ConfigFile.GetInt(S_CARLA_LEVELSETTINGS, TEXT("NumberOfPedestrians"), Settings.NumberOfPedestrians);
   ConfigFile.GetInt(S_CARLA_LEVELSETTINGS, TEXT("WeatherId"), Settings.WeatherId);
+  ConfigFile.GetInt(S_CARLA_LEVELSETTINGS, TEXT("SeedVehicles"), Settings.SeedVehicles);
+  ConfigFile.GetInt(S_CARLA_LEVELSETTINGS, TEXT("SeedPedestrians"), Settings.SeedPedestrians);
   Settings.WeatherDescriptions.Empty();
   ADynamicWeather::LoadWeatherDescriptionsFromFile(Settings.WeatherDescriptions);
   check(Settings.WeatherDescriptions.Num() > 0);
@@ -189,6 +191,8 @@ void UCarlaSettings::LogSettings() const
   UE_LOG(LogCarla, Log, TEXT("Number Of Vehicles    = %d"), NumberOfVehicles);
   UE_LOG(LogCarla, Log, TEXT("Number Of Pedestrians = %d"), NumberOfPedestrians);
   UE_LOG(LogCarla, Log, TEXT("Weather Id = %d"), WeatherId);
+  UE_LOG(LogCarla, Log, TEXT("Seed Vehicle Spawner = %d"), SeedVehicles);
+  UE_LOG(LogCarla, Log, TEXT("Seed Pedestrian Spawner = %d"), SeedPedestrians);
   UE_LOG(LogCarla, Log, TEXT("Found %d available weather settings."), WeatherDescriptions.Num());
   for (auto i = 0; i < WeatherDescriptions.Num(); ++i) {
     UE_LOG(LogCarla, Log, TEXT("  * %d - %s"), i, *WeatherDescriptions[i].Name);

Source/Carla/Game/CarlaSettings.h

@@ -94,6 +94,14 @@ public:
   UPROPERTY(Category = "Level Settings", VisibleAnywhere)
   TArray<FWeatherDescription> WeatherDescriptions;
 
+  /** Random seed for the pedestrian spawner. */
+  UPROPERTY(Category = "Level Settings", VisibleAnywhere)
+  int32 SeedPedestrians = 123456789;
+
+  /** Random seed for the vehicle spawner. */
+  UPROPERTY(Category = "Level Settings", VisibleAnywhere)
+  int32 SeedVehicles = 123456789;
+
   /// @}
   // ===========================================================================
   /// @name Scene Capture

Source/Carla/Util/ActorWithRandomEngine.h

@@ -25,7 +25,7 @@ protected:
   virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
 #endif // WITH_EDITOR
 
-protected:
+public:
 
   UFUNCTION(BlueprintCallable)
   URandomEngine *GetRandomEngine()

Source/Carla/Util/RandomEngine.h

@@ -6,7 +6,7 @@
 
 #include "RandomEngine.generated.h"
 
-UCLASS()
+UCLASS(Blueprintable,BlueprintType)
 class URandomEngine : public UObject
 {
   GENERATED_BODY()