Source/Nakatomi/Decorators/BTDIsWithinRange.cpp

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+// Fill out your copyright notice in the Description page of Project Settings.
+
+
+#include "../Decorators/BTDIsWithinRange.h"
+
+#include "AIController.h"
+#include "navigationSystem.h"
+#include "BehaviorTree/BlackboardComponent.h"
+#include "Nakatomi/NakatomiCharacter.h"
+
+bool UBTDIsWithinRange::CalculateRawConditionValue(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory) const
+{
+	UBlackboardComponent* BlackboardComponent = OwnerComp.GetBlackboardComponent();
+	float Dist = BlackboardComponent->GetValueAsFloat(DistanceKey.SelectedKeyName);
+	UObject* Target = BlackboardComponent->GetValueAsObject(TargetActorKey.SelectedKeyName);
+	auto TargetLocation = Cast<AActor>(Target)->GetActorLocation();
+	UNavigationSystemV1* NavigationSystem = FNavigationSystem::GetCurrent<UNavigationSystemV1>(GetWorld());
+
+	APawn* pawn = OwnerComp.GetAIOwner()->GetPawn();
+
+	if (pawn && NavigationSystem && TargetLocation != FVector::ZeroVector)
+	{
+		double Distance = -1.0;
+		NavigationSystem->GetPathLength(TargetLocation, pawn->GetTransform().GetLocation(), Distance);
+		return Distance <= Dist ? true : false;
+	}
+	
+	return false;
+}

Source/Nakatomi/Decorators/BTDIsWithinRange.h

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+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "BehaviorTree/BTDecorator.h"
+#include "BTDIsWithinRange.generated.h"
+
+/**
+ * 
+ */
+UCLASS()
+class NAKATOMI_API UBTDIsWithinRange : public UBTDecorator
+{
+	GENERATED_BODY()
+
+public:
+
+	UPROPERTY(EditAnywhere, Category = "Options",
+	Meta = (AllowPrivateAccess = "true", DisplayName = "Target Actor Key"))
+	FBlackboardKeySelector TargetActorKey;
+
+	UPROPERTY(EditAnywhere, Category = "Options",
+	Meta = (AllowPrivateAccess = "true", DisplayName = "Distance Key"))
+	FBlackboardKeySelector DistanceKey;
+
+public:
+
+	virtual bool CalculateRawConditionValue(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory) const override;
+	
+};