ChangeMaterial.cpp

// Fill out your copyright notice in the Description page of Project Settings.

#include "ChangeMaterial.h"
#include "DrawDebugHelpers.h"
#include "Components/BoxComponent.h"

// Sets default values
AChangeMaterial::AChangeMaterial()
{
 	// 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;


	MyMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("My Mesh"));
	MyMesh->SetupAttachment(RootComponent);
	RootComponent = MyMesh;

	MyBoxComponent = CreateDefaultSubobject<UBoxComponent>(TEXT("My BoxComponent"));
	MyBoxComponent->InitBoxExtent(FVector(100, 100, 100));
	MyBoxComponent->SetCollisionProfileName("Trigger");
	MyBoxComponent->SetupAttachment(RootComponent);

	OnMaterial = CreateDefaultSubobject<UMaterial>(TEXT("OnMaterial"));
	OffMaterial = CreateDefaultSubobject<UMaterial>(TEXT("OffMaterial"));

	MyBoxComponent->OnComponentBeginOverlap.AddDynamic(this, &AChangeMaterial::OnOverlapBegin);
	
}

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

	DrawDebugBox(GetWorld(), GetActorLocation(), FVector(100, 100, 100), FColor::White, true, -1, 0, 10);

	// Set the mesh for the material - begin with 'OffMaterial'
	MyMesh->SetMaterial(0, OffMaterial);
	
}

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

}

void AChangeMaterial::OnOverlapBegin(class UPrimitiveComponent* OverlappedComp, class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
	if ((OtherActor != nullptr) && (OtherActor != this) && (OtherComp != nullptr))
	{
		MyMesh->SetMaterial(0, OnMaterial);
	}
}

void AChangeMaterial::OnOverlapEnd(class UPrimitiveComponent* OverlappedComp, class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
	if ((OtherActor != nullptr) && (OtherActor != this) && (OtherComp != nullptr))
	{
		MyMesh->SetMaterial(1, OffMaterial);
	}
}