Modify AI perception sense range during runtime

Development Programming & Scripting
5

I took the code from v.s.'s post and split it into two functions, so that I can easily add the same thing for hearing or other senses. Something that may need explanation is how the LoseSightRadius value gets automatically set, it takes the difference of the current SightRadius from LoseSightRadius and adds that to NewSightRadius. In other words it keeps the same distance between SightRadius and LoseSightRadius and uses that with your NewSightRadius.

Header File

static UAISenseConfig* GetPerceptionSenseConfig(AAIController *Controller, TSubclassOf<UAISense> SenseClass);

UFUNCTION(BlueprintCallable)
		static bool SetSightRange(AAIController* Controller, float SightRange);

CPP File

UAISenseConfig* UYourFunctionLibrary::GetPerceptionSenseConfig(AAIController* Controller, TSubclassOf<UAISense> SenseClass)
{
	UAISenseConfig * result = nullptr;

	FAISenseID Id = UAISense::GetSenseID(SenseClass);
	if (!Id.IsValid())
	{
		UE_LOG(LogTemp, Error, TEXT("GetPerceptionSenseConfig: Wrong Sense ID"));
	}
	else if (Controller == nullptr)
	{
		UE_LOG(LogTemp, Error, TEXT("GetPerceptionSenseConfig: Controller == nullptr"));
	}
	else
	{
		UAIPerceptionComponent *Perception = Controller->GetAIPerceptionComponent();
		if (Perception == nullptr)
		{
			UE_LOG(LogTemp, Error, TEXT("GetPerceptionSenseConfig: Perception == nullptr"));
		}
		else
		{
			result = Perception->GetSenseConfig(Id);
		}
	}

	return result;
}

bool UYourFunctionLibrary::SetSightRange(AAIController* Controller, float SightRange)
{
	UAISenseConfig* Config = GetPerceptionSenseConfig(Controller, UAISense_Sight::StaticClass());
	if (Config == nullptr)
	{
		UE_LOG(LogTemp, Error, TEXT("SetSightRange: Config == nullptr"));
		return false;
	}
	else
	{
		UAISenseConfig_Sight *ConfigSight = Cast<UAISenseConfig_Sight>(Config);

		UE_LOG(LogTemp, Verbose, TEXT("SetSightRange was %f %f, setting to %f %f")
			, ConfigSight->SightRadius, ConfigSight->LoseSightRadius, SightRange, (ConfigSight->LoseSightRadius - ConfigSight->SightRadius + SightRange));

		// Save original lose range
		float LoseRange = ConfigSight->LoseSightRadius - ConfigSight->SightRadius;
		ConfigSight->SightRadius = SightRange;
		// Apply lose range to new radius of the sight
		ConfigSight->LoseSightRadius = ConfigSight->SightRadius + LoseRange;
		UAIPerceptionComponent *Perception = Controller->GetAIPerceptionComponent();
		Perception->RequestStimuliListenerUpdate();
	}

	return true;
}
2 Likes