Hi. AI perception usually targets the middle of a character(First person capsule). So when the player is behind objects like 100cm of height, AI cannot detect the player. How do I change the target to first-person camera? Thanks.
P.S My project is blueprint only
Some things require C++ and this is one of them. Here’s a tutorial:
Thank you. My project is blueprint only. Do I need to create my project from the beginning as c++ project?
Nope, you can just create a new C++ class as shown in the tutorial 
Hi. I just added the code to newely created character class. I built it successfully, Now there is no detecting sphere when playing. Ai cannot detect me when he sees me.
// Fill out your copyright notice in the Description page of Project Settings.
#include "MyCharacter.h"
// Sets default values
AMyCharacter::AMyCharacter()
{
// Set this character to call Tick() every frame. You can turn this off to improve performance if you don't need it.
PrimaryActorTick.bCanEverTick = true;
}
// Called when the game starts or when spawned
void AMyCharacter::BeginPlay()
{
Super::BeginPlay();
}
// Called every frame
void AMyCharacter::Tick(float DeltaTime)
{
Super::Tick(DeltaTime);
}
// Called to bind functionality to input
void AMyCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
Super::SetupPlayerInputComponent(PlayerInputComponent);
}
bool AMyCharacter::CanBeSeenFrom(const FVector& ObserverLocation, FVector& OutSeenLocation, int32& NumberOfLoSChecksPerformed, float& OutSightStrength, const AActor* IgnoreActor, const bool* bWasVisible, int32* UserData) const
{
FName Name_AILineOfSight = FName(TEXT("TestPawnLineOfSight"));
FHitResult HitResult;
FVector SightTargetLocation = GetMesh()->GetSocketLocation("spine_02");
AActor* actor = Cast<AActor>(HitResult.GetActor());
bool hit = GetWorld()->LineTraceSingleByChannel(HitResult, ObserverLocation, SightTargetLocation, ECC_Visibility, FCollisionQueryParams(Name_AILineOfSight, false, IgnoreActor));
if (!hit || (IsValid(actor) && actor->IsOwnedBy(this)))
{
OutSeenLocation = SightTargetLocation;
OutSightStrength = 1;
//return UAISense_Sight::EVisibilityResult::Visible;
return true;
}
OutSightStrength = 0;
return false;
}
I contacted “Code Like me” and he sent me the new code
for CLM_Character.h
// Fill out your copyright notice in the Description page of Project Settings.
#pragma once
#include "CoreMinimal.h"
#include "Perception/AISightTargetInterface.h"
#include "GameFramework/Character.h"
#include "CLM_Character.generated.h"
UCLASS()
class SHOOTLIKEME_API ACLM_Character : public ACharacter, public IAISightTargetInterface
{
GENERATED_BODY()
public:
// Sets default values for this character's properties
ACLM_Character();
protected:
// Called when the game starts or when spawned
virtual void BeginPlay() override;
public:
// Called every frame
virtual void Tick(float DeltaTime) override;
// Called to bind functionality to input
virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;
//virtual bool CanBeSeenFrom(const FVector& ObserverLocation, FVector& OutSeenLocation, int32& NumberOfLoSChecksPerformed, float& OutSightStrength, const AActor* IgnoreActor = NULL, const bool* bWasVisible = false, int32* UserData = NULL ) const;
virtual UAISense_Sight::EVisibilityResult CanBeSeenFrom(const FCanBeSeenFromContext& Context, FVector& OutSeenLocation, int32& OutNumberOfLoSChecksPerformed, int32& OutNumberOfAsyncLosCheckRequested, float& OutSightStrength, int32* UserData = nullptr, const FOnPendingVisibilityQueryProcessedDelegate* Delegate = nullptr);
};
For CLM_Character.cpp
// Fill out your copyright notice in the Description page of Project Settings.
#include "CLM_Character.h"
// Sets default values
ACLM_Character::ACLM_Character()
{
// Set this character to call Tick() every frame. You can turn this off to improve performance if you don't need it.
PrimaryActorTick.bCanEverTick = true;
}
// Called when the game starts or when spawned
void ACLM_Character::BeginPlay()
{
Super::BeginPlay();
}
// Called every frame
void ACLM_Character::Tick(float DeltaTime)
{
Super::Tick(DeltaTime);
}
// Called to bind functionality to input
void ACLM_Character::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
Super::SetupPlayerInputComponent(PlayerInputComponent);
}
UAISense_Sight::EVisibilityResult ACLM_Character::CanBeSeenFrom(const FCanBeSeenFromContext& Context, FVector& OutSeenLocation, int32& OutNumberOfLoSChecksPerformed, int32& OutNumberOfAsyncLosCheckRequested, float& OutSightStrength, int32* UserData, const FOnPendingVisibilityQueryProcessedDelegate* Delegate)
{
FName Name_AILineOfSight = FName(TEXT("TestPawnLineOfSight"));
FHitResult HitResult;
FVector SightTargetLocation = GetMesh()->GetSocketLocation("neck_01");
bool hit = GetWorld()->LineTraceSingleByChannel(HitResult, Context.ObserverLocation, SightTargetLocation, ECC_Visibility, FCollisionQueryParams(Name_AILineOfSight, true, Context.IgnoreActor));
if (!hit || IsValid(HitResult.GetActor()) && HitResult.GetActor()->IsOwnedBy(this))
{
OutSeenLocation = SightTargetLocation;
OutSightStrength = 1;
return UAISense_Sight::EVisibilityResult::Visible;
}
OutSightStrength = 0;
return UAISense_Sight::EVisibilityResult::NotVisible;
}
//bool ACLM_Character::CanBeSeenFrom(const FVector& ObserverLocation, FVector& OutSeenLocation, int32& NumberOfLoSChecksPerformed, float& OutSightStrength, const AActor* IgnoreActor, const bool* bWasVisible, int32* UserData) const
//{
// FName Name_AILineOfSight = FName(TEXT("TestPawnLineOfSight"));
// FHitResult HitResult;
// FVector SightTargetLocation = GetMesh()->GetSocketLocation("neck_01");
//
// bool hit = GetWorld()->LineTraceSingleByChannel(HitResult, ObserverLocation, SightTargetLocation, ECC_Visibility, FCollisionQueryParams(Name_AILineOfSight, true, IgnoreActor));
//
// if (!hit || IsValid(HitResult.GetActor()) && HitResult.GetActor()->IsOwnedBy(this))
// {
// OutSeenLocation = SightTargetLocation;
// OutSightStrength = 1;
// return true;
// }
//
// OutSightStrength = 0;
// return false;
//}
Now it works like a charm. Thanks