Sample AI Controller - GetRandomReachablePointInRadius - UE4

MovementAIController.cpp

#include "Test/MovementAIController.h"
#include "Runtime/Engine/Classes/Kismet/GameplayStatics.h"
#include "AI/NavigationSystemBase.h"
#include "NavigationSystem.h"


void AMovementAIController::BeginPlay()
{
	Super::BeginPlay();

	GoToRandomWaypoint();
}

void AMovementAIController::GoToRandomWaypoint()
{
	FVector Result;
	if (GetRandomPointInRadius(GetPawn()->GetActorLocation(), 600, Result)) {
		MoveToLocation(Result);
	}
}


bool AMovementAIController::GetRandomPointInRadius(const FVector& Origin, float Radius, FVector& OutResult)
{	
	UNavigationSystemV1* NavSys = FNavigationSystem::GetCurrent<UNavigationSystemV1>(GetWorld());
	if (!NavSys)
	{
		return false;
	}
	
	FVector Result;
	bool bSuccess = NavSys->K2_GetRandomReachablePointInRadius(GetWorld(), Origin, Result, 600);

	//Out
	OutResult = Result;
	return bSuccess;
}

void AMovementAIController::OnMoveCompleted(FAIRequestID RequestID, const FPathFollowingResult& Result)
{
	Super::OnMoveCompleted(RequestID, Result);

	GoToRandomWaypoint();
}

Hey I am trying to use and getting this error

CompilerResultsLog: Error: EnemyAIController.cpp.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: static bool __cdecl UNavigationSystemV1::K2_GetRandomReachablePointInRadius(class UObject *,struct FVector const &,struct FVector &,float,class ANavigationData *,class TSubclassOf)" (_imp?K2_GetRand
omReachablePointInRadius@UNavigationSystemV1@@SA_NPEAVUObject@@AEBUFVector@@AEAU3@MPEAVANavigationData@@v?$TSubclassOf@VUNavigationQueryFilter@@@@@z) referenced in function "public: bool __cdecl AEnemyAIController::GetRandomPointInRadius(struct FVector const &,float,struct FVector &)" (?GetRandomPointInRadius@AEnemyAIController@@QEAA_NAEBUFVector@@MAEAU2@@z)
CompilerResultsLog: Error: D:\Prabh\unreal\Devlopment\CoolTanks\Binaries\Win64\UE4Editor-CoolTanks-7059.dll : fatal error LNK1120: 2 unresolved externals

Probably you need to add some modules to the PublicDependencyModuleNames of your ProjectName.Build.cs file:

using System.IO;
using UnrealBuildTool;

public class ProjectName: ModuleRules
{
	public ProjectName(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
	
		PublicDependencyModuleNames.AddRange(
			new string[]
			{
				"Core", 
				"CoreUObject", 
				"Engine", 
				"InputCore", 
				"PhysicsCore",
				"AIModule", // ADD
				"NavigationSystem", // ADD
				
			}
		);
		
		....
	}
}

Usually LNK errors are related with that kind of issues.

thanks Dacanizares

…

On Sun, 15 May 2022 at 11:44, Daniel Cañizares Corrales < ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ Probably you're missing to add some modules to the PublicDependencyModuleNames of your ProjectName.Build.cs file: using System.IO; using UnrealBuildTool; public class ProjectName: ModuleRules { public ProjectName(ReadOnlyTargetRules Target) : base(Target) { PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs; PublicDependencyModuleNames.AddRange( new string[] { "Core", "CoreUObject", "Engine", "InputCore", "PhysicsCore", "DeveloperSettings", "Paper2D", "AIModule", // ADD "NavigationSystem", // ADD } ); .... } } Usually LNK errors are related with that kind of issues. — Reply to this email directly, view it on GitHub <https://gist.github.com/5db9c59281a9c9049bf819acce7e29bc#gistcomment-4167393>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ATWVK4BYCVX6RVMYTZGE4I3VKCI57ANCNFSM5SLJP5GA> . You are receiving this because you commented.Message ID: ***@***.***>

No problem!