Spawning actors in a box

Development Programming & Scripting
,
1

I’m trying to spawn fish at a random position inside of the box that I have assigned as my fish manager. But my current issue is that if they collide with a random object other than themselves, they will spawn at 0,0,0 and a big explosion of fish happens every time if there are objects in the box that are in the way of the fish. How do I find the objects in the scene that I can then tell the fish “Hey, this position is taken, go and find a new one”? Any help would be appreciated! Thank you.


#include "FishManager.h"
#include "FishActor.h"
#include "Components/BoxComponent.h"

// Sets default values
AFishManager::AFishManager()
{
 	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

	Root = CreateDefaultSubobject<USceneComponent>("Root");
	SetRootComponent(Root);
	
	BoxComponent = CreateDefaultSubobject<UBoxComponent>("Box Collider");
	BoxComponent->SetupAttachment(Root);
}

// Called when the game starts or when spawned
void AFishManager::BeginPlay()
{
	Super::BeginPlay();

	SpawnFish();
}

// Called every frame
void AFishManager::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);
}

//Gets a random location in the box collider set in the world.
FVector AFishManager::GetRandomLocation() const
{
	FVector BoxExtent = BoxComponent->GetScaledBoxExtent();
	FVector BoxOrigin = BoxComponent->GetComponentLocation();
	FBox Box(BoxOrigin - BoxExtent, BoxOrigin + BoxExtent);
	
	FVector RandomPoint = FMath::RandPointInBox(Box);
	return RandomPoint;	
}

void AFishManager::SpawnFish()
{
	FVector BoxExtent = BoxComponent->GetScaledBoxExtent();
	FVector BoxOrigin = BoxComponent->GetComponentLocation();

	for (int32 i = 0; i < FishAmount; i++)
	{
		FVector SpawnLocation = FMath::RandPointInBox(FBox(BoxOrigin - BoxExtent, BoxOrigin + BoxExtent));
		
		// Check if the spawn location is too close to any existing fish
		bool bTooClose = false;
		for (AFishActor* Fish : FishList)
		{
			if (FVector::Dist(SpawnLocation, Fish->GetActorLocation()) < 20.f)
			{
				bTooClose = true;
				break;
			}
		}
		
		// If the spawn location is too close to any existing fish, re-spawn or adjust the location
		if (bTooClose)
		{
			i--; // change this
			continue; 
		}

		// Spawn the fish
		AFishActor* NewFish = GetWorld()->SpawnActor<AFishActor>(FishClass, SpawnLocation, FRotator::ZeroRotator);

		NewFish->Fish.Size = 1; //Score
		NewFish->Fish.FishType = FishType::Small; // Maybe score too?
		
		NewFish->FishManager = this;
		FishList.Add(NewFish);
	}
}