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//Supose we are inside a Component                                 ACTOR OF THE COMP.
AREMHUD *hud = Cast<AREMHUD>(UGameplayStatics::GetPlayerController( this->GetOwner(),     0)->GetHUD());

//Custom HUD class: AREMHUD

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APlayerCameraManager *camManager = GetWorld()->GetFirstPlayerController()->PlayerCameraManager;
FVector camLocation = camManager->GetCameraLocation();
FVector camForward  = camManager->GetCameraRotation().Vector();

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#include "DrawDebugHelpers.h"
DrawDebugLine(GetWorld(), traceStart, traceEnd, FColor::Green, true, 1.0f);

sephirot47

#pragma once

#include "CoreMinimal.h"
#include "EngineUtils.h"
#include "DrawDebugHelpers.h"

inline void DrawDebugQuad(const UWorld* World, const FVector& BotLeft, const FVector& TopLeft, const FVector& TopRight, const FVector& BotRight, const FColor& Color = FColor::Green, const bool bPersistentLines = false, const float LifeTime = -1.0f, const uint8_t DepthPriority = 0, const float Thickness = 0.0f)
{
	DrawDebugLine(World, BotLeft, TopLeft, Color, bPersistentLines, LifeTime, DepthPriority, Thickness);
	DrawDebugLine(World, TopLeft, TopRight, Color, bPersistentLines, LifeTime, DepthPriority, Thickness);

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//For every actor in this level...
for (TActorIterator<AActor> actor(GetWorld()); actor; ++actor)
{
  //Do whatever you want with your actor
  actor->BlahBlah();
}

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const APlayerController* PlayerController = GetWorld()->GetFirstPlayerController();

// Get viewport size
int ViewportSizeX, ViewportSizeY;
PlayerController->GetViewportSize(ViewportSizeX, ViewportSizeY);

// Deproject screen point
FVector ShotStart, ShotDirection;
PlayerController->DeprojectScreenPositionToWorld(ViewportSizeX * 0.5f, ViewportSizeY * 0.5f, ShotStart, ShotDirection); // Assuming crosshair is in screen center
ShotStart += ShotDirection * 100.0f; // Offset a bit so that shot starts from gun end

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/*
Ok, so you want to change your Object Type (or collision channel) to a custom channel in runtime.
But there's a problem, it seems UE4 doesn't support this yet, but there's a workaround hehe :)

For example, imagine you create the ObjectType Building. 
Now, imagine you want to change the ObjectType of all the StaticMeshComponents of the object OBJECT (from WorldStatic to Building, for example).

You can try something like this:
*/

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// MyClass.h  ==============================
UClass *mBlueprintClass = nullptr;
// ==========================================

// MyClass.cpp ==============================
MyClass::MyClass()
{
	static ConstructorHelpers::FObjectFinder<UBlueprint> blueprint_finder(TEXT("Blueprint'/Game/Path/To/Asset/MyBlueprint.MyBlueprint'")); // This path can be obtained from the editor doing right click + "Copy Reference"
	if (blueprint_finder)

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/*
IMPORTANT! 
In order to be able to use this functions, in the file "YourProject.h" change this:

    #include "EngineMinimal.h"
    
For this:

    #include "Engine.h"

sephirot47

//En el constructor (no el BeginPlay)

UTexture2D *texture;
static ConstructorHelpers::FObjectFinder<UTexture2D> Texture(TEXT("/Game/StarterContent/Textures/T_Spark_Core.T_Spark_Core"));
texture = Texture.Object;